For anyone that might be interested: I just found a 1969 Black soul food recipe book in the Seattle digital archive collection. The whole thing is there: 50 recipes, all submitted by Black Seattleites, and compiled/published by the (sadly defunct) Central District radio station KYAC:
https://cdm16118.contentdm.oclc.org/digital/collection/p16118coll37/id/984/rec/38
