LIST OF GEOLOGICAL LEAFLETS ISSUED TO DATE 
No. 1. Model of an Arizona Gold Mine $ .10 
No. 2. Models of Blast Furnaces for Smelting Iron . .10 
No. 3. Amber— Its Physical Properties and 
Geological Occurrence 10 
No. 4. Meteorites 10 
No. 5. Soils 10 
No. 6. The Moon . .10 
No. 7. Early Geological History of Chicago 25 
No. 8. Agate . . 50 
No. 9. How old are Fossils? 25 
D. C. DAVIES, Director 
FIELD MUSEUM OF NATURAL HISTORY 
CHICAGO, U. S. A. 
