The Guadalupian: Proposed International Standard for a Middle Permian Series Glenister, Brian F. ; Boyd, D. W. ; Furnish, W. M. ; Grant, R. E. ; Harris, M. T. ; Kozur, H. ; Lambert, L. L. ; Nassichuk, W. W. ; Newell, N. D. ; Pray, L. C. ; Spinosa, C. ; Wardlaw, B. R. ; Wilde, G. L. ; Yancey, T. E. Abstract Publication: International Geology Review Pub Date: September 1992 DOI: 10.1080/00206819209465642 Bibcode: 1992IGRv...34..857G