TY  - BOOK
AU  - Sebold,Mary Theodine
TI  - Learning the basic concepts in fractions and their application in the addition and subtraction of simple fractions
AV  - QA137 .S43
U1  - 411.407 
PY  - 1946///
CY  - Washington, D.C.
PB  - The Catholic university of America press
KW  - Fractions
KW  - Study and teaching
KW  - Local
N1  - At head of title: The Catholic university of America; Thesis (PH.D.)--Catholic university of America; Bibliography: p. 83-88
ER  -