Corrections and revisions for U.S. Geological Survey bulletin 930-D :
Spirit leveling in Illinois, 1896-1942 : part 4, Northern Illinois.
APA Citation
Illinois State Geological Survey. (1966). Corrections and revisions for U.S. Geological Survey bulletin 930-D: Spirit leveling in Illinois, 1896-1942 : part 4, Northern Illinois. Urbana, Ill.: Illinois State Geological Survey.
MLA Citation
Illinois State Geological Survey. Corrections And Revisions for U.S. Geological Survey Bulletin 930-D: Spirit Leveling In Illinois, 1896-1942 : Part 4, Northern Illinois. Urbana, Ill.: Illinois State Geological Survey, 1966.
Warning: These citations may not always be complete (especially for serials).