1. Elasticity and constitution of the earth's interior;Birch;J. Geophys. Rea.,1952
2. Crust of the earth (A Symposium);Poldervaart;Geol. Soc. Am. Spec. Paper,1954
3. The problem of the earth's density variation;Bullen;Bull. Seismol. Soc. Am.,1940
4. The density variation of the earth's central core;Bullen;Bull. Seismol. Soc. Am.,1942
5. The times of P, S, and SKS and the velocities of P and S;Jeffreys;Monthly Not. Roy. Ast. Soc. Geophya. Suppl.,1939