00362nam a22001337a 450000500170000000800410001702000150005805000190007310000150009224500510010725000100015826000380016830000220020620260410125436.0260410b        |||||||| |||| 00| 0 eng d  a0471504394  aQC19.2.C6 1962  aR, Courant  aMethods of mathematical physics /c R, Courant  avol 2  aNew yorkbJohn wiley & sonsc1962  axxii, 830p, bpbk