000
00260nam a2200109 4500
008
160616s 000 0
245
_a
Mathematical discovery, v.2
100
_a
Polya, George
500
_a
B k2.1 k2.1; k2.2
942
_c
BK
_2
BK2139
080
_a
51 POL
999
_c
2139
_d
2139