Cowboy Westerns

Ongoing Serial: a series of episodes, published over a span of weeks/months/years where the story plot is connected from chapter to chapter and must be read in chronological order for it to be understood properly.
Chapter Serial: a series of episodes, published over a span of weeks/months/years where the story plot is self-contained to a single chapter. There may be an overarching plot, but the stories can generally be read in any order and be understood
Book: an all-in-one self contained story published as a one-off.
Supplement: an an all-in-one self contained story published as a stand-alone supplement to a regular weekly/monthly periodical.
Short Story: an all-in-one, self contained story that was published in a regular weekly/monthly periodical
Anthology: a collection of all-in-one, self contained stories that were published in a regular weekly/monthly periodical but are generally grouped together.

Cactus Kid, The (Manga)

Also sometimes referred to as Milkhall Territory, Osamu Tezuka’s cowboy adventure, Mr. Cactus (1951-54) was originally published over 23 monthly instalments in Shonen Illustrated from April 1951 to March 1953. It was followed by Cyrano the Hero (1953) from April to November 1953, before resuming for another 12 monthly instalments from December 1953 to December 1954.

Age of Adventure (Manga)

The Age of Adventure, also known as "West Rush", was originally published in Akita Shoten's monthly Adventure King from January 1951 to August 1953. It is partially based on Tezuka's earlier amateur work, Old Man's Treasure Island from 1945.

Captain Ken (Manga)

Following on the heels of the successful run of Zero Men (1959-60), Tezuka's Captain Ken (1960-61) was serialized in Weekly Shonen Sunday from December 18, 1960 to August 20, 1961.