Horses in Philately. Interesting and attractive site - http://horse-stamps.narod.ru/index-en.html

Archaeology in philately. The Origin of Man (Polish). Beautiful site, excellent scans - http://www.archeofil.pl/index.php

Don's Maps. Resources for the study of Palaeolithic / Paleolithic European, Russian, Ukrainian and Australian Archaeology / Archeology - https://donsmaps.com

Free electronic biological library - https://zoomet.ru/

Paleophilatelie. Website about Paleontology in Philately - http://paleophilatelie.eu/