TY  - BOOK
AU  - Wittgenstein Ludwig
TI  - Protoractatus :  an early version of tractatus logico-philosophious ed by B F Mcguinness etc
U1  - R3xM891,1, K1;L1 
PY  - 1971///
CY  - London
PB  - Routledge and Kegan Paul    
ER  -