https://openlibrary.org/books/OL24230334M.opdsGeographic aspects of information systems introduction and selected bibliography2022-12-31T03:22:34ZBarry S. Wellarhttps://openlibrary.org/authors/OL2075172A/Barry_S._WellarCouncil of Planning Librarians][Monticello, Il197128 p.https://openlibrary.org/books/OL24230334Mhttps://archive.org/details/geographicaspect239well339360