PT  - JOURNAL ARTICLE
AU  - Wallace, Samuel Jacob
TI  - On the "geodes" of the Keokuk Formation and the genus Biopalla, with some species
AID  - 10.2475/ajs.s3-15.89.366
DP  - 1878 May 01
TA  - American Journal of Science
PG  - 366--370
VI  - s3-15
IP  - 89
4099  - http://www.ajsonline.org/content/s3-15/89/366.short
4100  - http://www.ajsonline.org/content/s3-15/89/366.full
SO  - Am J Sci1878 May 01; s3-15