The American Library Association Code Adopted at the 1939 Midwinter Meeting by the ALA Council; amended June 30, 1981; June 28, 1995; and January 22, 2008.
you are confused with 1939-Code of Ethics of the American Library Association but ala cataloguing rules is-1949 visit https://archive.org/stream/alacatalogingrul007642mbp/alacatalogingrul007642mbp_djvu.txt
The American Library Association Code adopted at the 1939 Midwinter Meeting by the ALA Council; amended June 30, 1981; June 28, 1995; and January 22, 2008
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Vatican Code is 1931
K.Murugan
visit
https://archive.org/stream/alacatalogingrul007642mbp/alacatalogingrul007642mbp_djvu.txt
It was truly informative. Your site is extremely helpful.
Many thanks for sharing!