Crossref releases dumps of their database on the 5th of every months. These dumps sometimes change after the fact. This metadata, stored in this package, locks down the versioning of the dumps for our analyses.
md_cr_snaps_m() update_md_cr_snaps_m() get_md_cr_snaps_m()
To lock down the reproducibility of the metadata dumps, we store their checksums in this package, instead of merely relying on their release date. (They have sometimes been updated in the past after release.)
Computing a checksum ourselves would be quite expensive Gets metadata from the AWS S3 response header.
Happily, this works without authorisation for Metadata Plus.
Current monthly snapshots:
knitr::kable(md_cr_snaps_m())
| period | url | date_modified | etag | size |
| 2018-05 | https://api.crossref.org/snapshots/monthly/2018/05/all.json.tar.gz | 2018-06-08 20:32:07 | 5fdf4c3e01a713c4391fbc193391a948-5803 | 48673539319 |
| 2018-06 | https://api.crossref.org/snapshots/monthly/2018/06/all.json.tar.gz | 2018-07-26 20:33:22 | 66daedd99bbac1b0406588af39654199-5913 | 49595814726 |
| 2018-07 | https://api.crossref.org/snapshots/monthly/2018/07/all.json.tar.gz | 2018-08-04 19:15:24 | 8b9581b551ac55e255efffed7553dc78-5937 | 49800224394 |
| 2018-08 | https://api.crossref.org/snapshots/monthly/2018/08/all.json.tar.gz | 2018-09-03 20:04:12 | 3250e1960d390c879cacf7ae8fe8e4e0-6006 | 50374663277 |
| 2018-09 | https://api.crossref.org/snapshots/monthly/2018/09/all.json.tar.gz | 2018-10-11 19:28:42 | 48dd8175cf4ef52f8452745629310e79-6153 | 51606812435 |
| 2018-10 | https://api.crossref.org/snapshots/monthly/2018/10/all.json.tar.gz | 2018-11-03 22:07:04 | 2de16d1ccc8fa906aa26f49d2fe752e7-6235 | 52296866610 |
| 2018-11 | https://api.crossref.org/snapshots/monthly/2018/11/all.json.tar.gz | 2018-12-03 22:02:12 | 123a2132ede3991a4bee12d96e4ae51c-6169 | 51747932929 |
| 2018-12 | https://api.crossref.org/snapshots/monthly/2018/12/all.json.tar.gz | 2019-01-05 01:24:48 | 250e3e72cc5bd4ab5dbec899b8db7580-6267 | 52564041493 |
| 2019-01 | https://api.crossref.org/snapshots/monthly/2019/01/all.json.tar.gz | 2020-02-19 19:19:18 | 6305e97bb00c764b1102d22c2be6d663-8495 | 71258741599 |
| 2019-02 | https://api.crossref.org/snapshots/monthly/2019/02/all.json.tar.gz | 2019-03-04 14:52:26 | dd03bf567aed0e41b3736d9e9f607e85-6647 | 55758917898 |
| 2019-03 | https://api.crossref.org/snapshots/monthly/2019/03/all.json.tar.gz | 2019-04-03 14:16:02 | fe2cd8dd764503640f74806e34248781-6840 | 57377765958 |
| 2019-04 | https://api.crossref.org/snapshots/monthly/2019/04/all.json.tar.gz | 2019-05-03 23:16:04 | 160dc0f8d12b3c91c6ed2ad0df87b4e4-7170 | 60145344184 |
| 2019-05 | https://api.crossref.org/snapshots/monthly/2019/05/all.json.tar.gz | 2019-06-04 12:16:05 | 1eb34559b0e80b6ad778c7a40d1dd45e-7623 | 63942201992 |
| 2019-06 | https://api.crossref.org/snapshots/monthly/2019/06/all.json.tar.gz | 2019-07-13 16:05:50 | 586e1ace0577ca44c422a0029960098b-7773 | 65197539697 |
| 2019-07 | https://api.crossref.org/snapshots/monthly/2019/07/all.json.tar.gz | 2019-08-04 05:46:04 | 31af31381ff92756beb7ab7559c33291-7858 | 65912914209 |
| 2019-08 | https://api.crossref.org/snapshots/monthly/2019/08/all.json.tar.gz | 2019-09-04 07:46:04 | 17782fc0071ee11ff5db519446e1edf0-7945 | 66646812608 |
| 2019-09 | https://api.crossref.org/snapshots/monthly/2019/09/all.json.tar.gz | 2019-10-04 12:42:40 | 196ea8897b159c0378dc5086d6fca861-8043 | 67464925959 |
| 2019-10 | https://api.crossref.org/snapshots/monthly/2019/10/all.json.tar.gz | 2019-11-13 13:42:20 | 5eef0f01562f7bc31d5a016fbd6042f7-5933 | 99530559599 |
| 2019-11 | https://api.crossref.org/snapshots/monthly/2019/11/all.json.tar.gz | 2019-12-05 17:16:04 | 3e417701f575d2a9a19582d2606231d2-8307 | 69683786041 |
| 2019-12 | https://api.crossref.org/snapshots/monthly/2019/12/all.json.tar.gz | 2020-01-06 20:39:19 | 66db92cdd582f8cf93b03e9b3ade167d-8424 | 70662719003 |
| 2020-01 | https://api.crossref.org/snapshots/monthly/2020/01/all.json.tar.gz | 2020-02-19 19:40:08 | 6305e97bb00c764b1102d22c2be6d663-8495 | 71258741599 |
| 2020-02 | https://api.crossref.org/snapshots/monthly/2020/02/all.json.tar.gz | 2020-03-05 10:21:09 | cf5dbcfb9f8c4e01d7dd0d718429b642-8558 | 71782804006 |
| 2020-03 | https://api.crossref.org/snapshots/monthly/2020/03/all.json.tar.gz | 2020-04-04 08:31:09 | 47b39e33efd9824c7c5c68f06021ba88-8658 | 72624782825 |
| 2020-04 | https://api.crossref.org/snapshots/monthly/2020/04/all.json.tar.gz | 2020-05-11 11:52:41 | 104df834ffb8ff0dfd20e121a6318618-8823 | 74010463525 |
| 2020-05 | https://api.crossref.org/snapshots/monthly/2020/05/all.json.tar.gz | 2020-06-04 13:31:09 | aeafd8a98336812226affb0bedc973cd-8908 | 74724383102 |
| 2020-06 | https://api.crossref.org/snapshots/monthly/2020/06/all.json.tar.gz | 2020-07-04 12:31:08 | f5fbc47585eb76f74887decf4b4d36e7-9013 | 75604365177 |
| 2020-07 | https://api.crossref.org/snapshots/monthly/2020/07/all.json.tar.gz | 2020-08-04 16:31:04 | 1e56d469216fc77d07d103a15d9d7427-9120 | 76498078549 |
| 2020-08 | https://api.crossref.org/snapshots/monthly/2020/08/all.json.tar.gz | 2020-09-05 17:34:33 | 5cb71554733ac30fcb95c0b99d4c7138-9230 | 77423432433 |
| 2020-09 | https://api.crossref.org/snapshots/monthly/2020/09/all.json.tar.gz | 2020-10-27 21:16:29 | 1936b0825dec4b11db705f8053b7da78-9415 | 78973357479 |
| 2020-10 | https://api.crossref.org/snapshots/monthly/2020/10/all.json.tar.gz | 2020-11-05 06:01:07 | ab52c1f7a2235692faa34d431751badb-9451 | 79275265379 |
| 2020-11 | https://api.crossref.org/snapshots/monthly/2020/11/all.json.tar.gz | 2020-12-05 09:31:09 | 7216bfd6eafcd0ff83894acece592c29-9556 | 80153941136 |
| 2020-12 | https://api.crossref.org/snapshots/monthly/2020/12/all.json.tar.gz | 2021-01-12 16:46:08 | 8f0977e27c695a954f843503a6120946-6367 | 106818152559 |
| 2021-01 | https://api.crossref.org/snapshots/monthly/2021/01/all.json.tar.gz | 2021-02-05 17:01:08 | 242406bc4cce046eaae133f4cf648978-6482 | 108733400373 |
| 2021-02 | https://api.crossref.org/snapshots/monthly/2021/02/all.json.tar.gz | 2021-03-05 18:31:09 | e259608e23b932b6aed7f7c67b5256b9-6564 | 110120778006 |
| 2021-03 | https://api.crossref.org/snapshots/monthly/2021/03/all.json.tar.gz | 2021-04-05 17:31:08 | 9a730fb1461b0f170940845fbb93dd2f-6642 | 111419433519 |
update_md_cr_snaps_m: Update the metadata of monthly snapshots stored in leine
get_md_cr_snaps_m: Get metadata for currently available monthly snapshots