This Essay on Classic Austrian Postal Forms explains their types and uses from their first appearance until the 1880 renumbering (for which see here).
This Essay on The 1880 Postal Form renumbering discusses the 1880 renumbering.
This is referred to in "The Story of the Austrian Post up to 1850" published in 2021 by the Austrian Philatelic Society.
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©APS. Last updated 11 June 2010