TY  - BOOK
AU  - Shapiro,Gary Louis
TI  - Factors influencing the variance in sign learning performance by four juvenile Orangutans (Pongo pygmaeus)
PY  - 1985///
KW  - University of Oklahama
KW  - Dissertations
KW  - Orangutan
KW  - Sign language
KW  - Dissertations, Academic
KW  - Oklahoma
N1  - Thesis (Ph.D.) - University of Oklahama, 1985
ER  -