Help us out Polisky! If you have a paper where you struggled (or succeeded) in counting or studying hard-to-reach populations in CONTEMPORARY ADVANCED WESTERN DEMOCRACIES, please let me know by emailing or replying. My coauthor + I are familiar with the religion lit, less so other groups. Thanks!

Not polisky, but if it's methods or general examples you're after, see Heckathorn's work on respondent-driven sampling of hidden populations. RDS has been used on jazz musicians, undocumented immigrants, drug users, people with HIV/AIDS, etc. Heckathorn & Salganik 2004 Soc Meth is 1 starting point.

I have an R&R on this at Survey Research Methods - stay tuned 😉