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Labeled drawing by Trinkaus of frog in late embryo and tadpole stage, Embryology course, graded A, March 7, 1938
Labeled drawing by Trinkaus of unknown organism embryo, Embryology course, April 24, 1938
Labeled drawing by Trinkaus of 21 hour chick embryo, Embryology course, graded A, March 19, 1938
Labeled drawing by Trinkaus of 23 hour chick embryo, Embryology course, graded A-, March 21, 1938
Partial notes by Trinkaus on chick embryos, Embryology course, April 4, 1938
Partial notes by Trinkaus on chick embryos, Embryology course, April 4, 1938
Labeled drawing by Trinkaus of 24 hour chick embryo, Embryology course, March 20, 1938
Labeled drawing by Trinkaus of frog embryo stages, Embryology course, March 5, 1938
Partial notes by Trinkaus on 96 hour chick embryos, Embryology course, May 16, 1938
Partial Notes by Trinkaus on 72 hour chick embryos, Embryology course, April 25, 1938
Labeled drawing by Trinkaus of 33 hour chick embryo, Embryology course, with teacher's note, March 21, 1938
Labeled drawing by Trinkaus of 24 hour chick embryo, Embryology course, March 20, 1938

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