Using letters instead of numbers

LDR 00830nam a22002411 4500
001 008000199
003 MiAaHDL
005 20100505000000.0
006 m d
007 cr bn ---auaua
008 841108s1971 xx 000 0 eng d
020 ‡a0335025072
035 ‡asdr-pst.a295662
035 ‡a(OCoLC)2306261
035 ‡aLIAS371649
040 ‡aPSt ‡cPSt ‡dWaOLN
100 1 ‡aHussey, Michael.
245 1 0 ‡aUsing letters instead of numbers / ‡cprepared by Michael Hussey for the Technology Course Team.
260 ‡aBletchley, Eng. : ‡bOpen University Press, ‡cc1971.
300 ‡a23 p. : ‡bill. ; ‡c30 cm.
490 0 ‡aTechnology Founcation Course ; unit 4, Supplement
500 ‡aT100 4S.
538 ‡aMode of access: Internet.
650 0 ‡aMathematical notation.
650 0 ‡aAlgebra.
710 2 ‡aOpen University. ‡bTechnology Foundation Course Team.
CID ‡a008000199
DAT 0 ‡b20100505000000.0
DAT 1 ‡a20120815061909.0 ‡b2024-01-04T19:34:33Z
CAT ‡aSDR-PST ‡dUNKNOWN ‡lloader.pl-001-001
FMT ‡aBK
HOL ‡0sdr-pst.a295662 ‡apst ‡bSDR ‡cPST ‡ppst.000010005514 ‡sPST ‡1a295662
974 ‡bPST ‡cPST ‡d20240104 ‡sgoogle ‡upst.000010005514 ‡y1971 ‡ric ‡qbib ‡tnon-US bib date1 >= 1930