https://ia803208.us.archive.org/view_archive.php?archive=/0/items/natsocpaste/pastebin_backup_20200715.zip&file=Race%20Mixing-UkPYEtHf.txt has the text:
" Mixed race children suffer from more health problems:
Racemixing leads to outbreeding depression & pairings of non-complementary traits.
A massively well-funded study of over 100,000 schoolchildren found that “Adolescents who identify themselves as mixed race are at higher health and behavior risk than those of 1 race.” Indeed, even when controlling for education, socioeconomic status, and other factors, there is an across-the board higher rate of health risks amongst mixed race adolescents than mono-racial adolescents.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1448064/ ; https://sci-hub.tw/10.2105/ajph.93.11.1865 "

I think these pastes might be part of a series of pastes which these are part of:
https://archive.org/search.php?query=subject%3A%22text%20file%22%20%22pastebin.com%22 - 10 results (https://archive.org/details/54797065645061746873 484b45595f43555252454e545f55534552 547970656450617468 4578706c6f726572 jewsandcommunismtextfiledoc adolfhitlerwasnotajewtextfl 5245475f535a 75726c31 dangersofhomosexualitytextf fightwhitegenocidetextfilep)