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Link to the Yale Mexico Collection
HERE
Bibliography:
Archivo General de Notarías (Mexico)
Indice y extractos de los protocolos del archivo de notarias de Mexico, D. F. / [por] A. Millares Carlo y J. I. Mantecon.
México, D.F. : Colegio de México, 1945-1946.
Mexico Ct C945n
Mexican institutions and archives [microform] : their history and development /
Virginia Ann. Newton
U of Texas Dissertation (check library at U of T or Proquest)
Main search is for contracts and formal economic agreements - book of published item? PARES? look around for such a thing.