1929 to 1935/36 Catalogs
Artist, Josef Danilowatz, an Austrian artist, provided the cover pages for many
of the Marklin catalog in the 1930's. His work was also reproduced as the rear
cover on some 1970's catalogues.
https://de.wikipedia.org/wiki/Josef_Danilowatz
1930's OO Supplements
When Marklin introduced OO (later HO) in 1935, OO catalogues were introduced and
included as pages in the main catalogues of the time.
1947
Due to paper shortages, the 1947 catalogue was issued exclusively for the
dealers with supplements available in later years
1947 SWISS Catalog, The Märklin catalog, which only existed once
A special one-off catalogue was created in 1947 for the Swiss market. A post-war
export program was important as it brought much needed foreign currency to
German.
http://www.miba.de/miba/98/04/90.htm
[German text]
2004 Catalogue
There was no Main Catalogue printed in calendar year 2004. The previous
"Complete Program 2003/04" catalog was produced in late 2003 and was replaced in
early 2005 by hard cover "Presentation Books" for each scale