| https://d.lib.msu.edu/gress/84/OBJ/view#page=12 | 07/10/2017 | PDF Reader | | Item is within a single large file |
| https://listings.lib.msu.edu/gress/2015vol3.pdf#page=12 | 02/28/2017 | PDF Reader | | Item is within a single large file |
| https://issuu.com/nga.no/docs/gressforum_03_2015_web/12 | 2/13/2017 | JavaScript | | Item is within a single large file |
| http://www.sterf.org/Media/Get/2166/krypkveinsorte[...] | 10/17/2017 | PDF Reader | | Popular Scientific Articles - STERF reprint; Variant pictures |
| http://sterf.dynamaster.se/Media/Get/2165/krypvens[...] | 10/17/2017 | PDF Reader | | Popular Scientific Articles - STERF Swedish reprint; Variant pictures |
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