000 00287pam a2200121a 44500
010 _a64016505
082 _a530
_bAC21E
100 _aWaller, Richard
245 1 _aESSAYES OF NATURAL EXPERIMENTS
260 _a
_bJohnson Reprint Corporation
_c1964
964 _gCIRC
997 _a55416 C
999 _c409368
_d409368