text Richard D. Irwin 1981 ind xii, 117 hlm. : il. 26 cm. Ralph M. Stair programming 001.642 001.642 Sta e 1 INLIS000000000046218 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)