19th completely revised and enlarged ed. cxxviii, 1981 s. : il. ; 31 cm + 1 CD-ROM

18th completely rev. and enl. ed. cxviii, 1823 s. : il. + 1 CD-ROM

17th completely rev. and enl. ed. xlviii, 1932 s. ; 32 cm + 1 CD ROM

16th completly rev. and enl. ed. xvii, 1415 s. : il. ; 30 cm