I don't know if this was what came around before (I'm a newbie), but this blog has tons of old breastfeeding pictures and may be what you are looking for. Be sure to check older entries. There are some really good ones posted in the past. Group photos with women obviously breastfeeding in public from the 1930's.
http://www.mothering.com/jenniferjames/
-Deann
RNC-NIC, pending IBCLC from this summer!
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