1. A classification of the Jurassic ammonites;Arkell;Jour. Paleont.,1950
2. Stratigraphy: a factor in paleontologic taxonomy;Bell;Jour. Paleont.,1950
3. The species concept: a semantic review;Burma;Evolution,1949a
4. Postscriptum;Burma;Evolution,1949b
5. Biosystematy;Camp;Brittonia,1951