How old are fossils?
Geology leaflet (Field Museum of Natural History) ; no. 9
Roy, Sharat Kumar, 1897-1962
Field Museum of Natural History. Department of Geology.
Chicago :Field Museum Press,1927.
Pages also numbered 141- at foot of pages.
Fieldiana, Popular series, Geology, was published by Field Museum of Natural History, Dept. of Geology as Leaflet (no. 1-4, 1922-1923) and as Geology leaflet (no. 5-14, 1925-1933). The Leaflet series
507.73 .I3, F5, no. 5
Find in a local library