20698. Heinrich, E. W.   Holmquistite and Pegmatitic Lithium Exomorphism.   International Mineralogical Association, 1965, The Indian Mineralogist, 6 (1&2) : 1-13.   Printed wraps, minor signs of use and age discoloration, very good condition.   In English.   $5.00

20699. Biggar, G. M. and Clarke, D. B.   Aspects of Phase Equilibria in the Inversion and Exsolution of Pyroxenes.   International Mineralogical Association, 1971, The Indian Mineralogist, 12 : 1-13, 6 figures.   Reprint, stapled text, minor signs of use and age discoloration, very good condition.    $3.25