Higgs Donald V Angular relations of lines and planes :Basic graphical and numerical methods for the solution of geologic and crystallographic problems Higgs Donald V; Tunell George - 2 2 - San Francisco W H Freeman 1966 - vi,43p. cm. plates Bibliography p. Standard No.: 63557 Source: Textual Subjects--Topical Terms: Minerology Dewey Class. No.: H1:B, K6