The database Georef shows a fair amount of material on Hermosillo before 1970.  The earliest record I saw was from 1900. 

Pam Enrici
Engineering, Science, and Geography librarian
Univ. of MN., Duluth (on the shores of Lake Superior)


On Wed, Jul 15, 2015 at 10:58 AM, Mark Walker <[log in to unmask]> wrote:
Dear Friends,

I received an inquiry today from a engineer doing an environmental study around Hermosillo. He is looking for pre 1970s information " any historical topographic maps, geologic maps, aerial photographs, or land use maps for the Hermosillo area with a scale around 1:50,000.”

I can’t find anything older than 1975. Any ideas if anything exists prior to 1975?


Mark Walker
World Map Source / Mexico Maps
3920 Maricopa Drive
Santa Barbara CA 93110-1414
805-448-7273 mobile
805-687-1011 office