Macroinvertebrate sampling techniques for streams in semi-arid regions : comparison of the Surber method and a unit-effort traveling kick method /

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Some empirical-theoretical considerations of uranium nitride in zirconium /

In this paper our method is critically examined to obtain a better understanding of the complexities of the system.

Some empirical tests in vocational selection,

Published also as thesis (PH. D.) Columbia University, 1921.

An empirical study of three stochastic approximation techniques applicable to sensitivity testing (U)

Photocopy.