11099. Buschbach, T. C.   The Morphology of the Sub-St. Peter Surface of Northeastern Illinois.   Illinois Academy of Science, 1961, Transactions, 54 (1 and 2) : 83-89, 5 figures.   Off-print, good plus condition.    $4.00

20579. Nicol, D. and Eggert, D. A.   Taxonomic Summary of Inorganic Protective or Supporting Structures Precipitated by Animals and Plants.   Illinois Academy of Science, 1965, Transactions, 58 (2) : 95-101.   Printed wraps, minor signs of use and age discoloration, very good condition.    $4.50