John Coleman Burroughs (1913 - 1979)

Boixcar / Guillermo Sánchez Boix (1917 - 1960)

"Boixcar (pen name of Guillermo Sánchez Boix; 1917, Barcelona—1960) was a Catalan-Spanish cartoonist.
He began his career in the mid-1940s. His first comics include El Caballero Negro ("The Black Knight", 1945), El Puma (1946), and La Vuelta al Mundo de dos Muchachos ("The Two Boys' Return to the World", 1948).
He gained popularity with his comic book Hazañas Bélicas ("War Deeds", first issue in 1948, second one in 1950). It drew inspiration from the recent events of World War II (and later of the Korean War), with an accent placed on human values expressed in the most desperate situations, the sentimentalism of the action being in contrast with the spectacularly realistic depiction of weapons and vehicles. The Hazañas' success made the editor issue another in the series, as Hazañas Bélicas Extra, increased in content that due to Boixcar's collaboration with several other artists on the project." - quote source

See more amazing artworks by Boxicar at El Desvan del Abuelito's first and second articles on the artist.
Additional artworks by Boxicar in this article at Autores De Tebeos.

Similar Spanish pulp illustrations by Mathias Alonso can be viewed here.

Tales Of Suspense Covers

Read more about the series and the artists involved in this article at Wikipedia.

Leonard Brandt (L.B) Cole (1918 - 1995)

"Leonard Brandt Cole had worked as art director for a lithography outfit, before entering the comic book field during the Golden Age in the early 1940's. He was mainly a cover illustrator for titles like Suspense Comics and Contact Comics. In his early work, he always used basic, flat colors and produced what he called "poster color covers". Illustrating over 1500 covers, Cole drew everything from funny animals to superheroes to jungle girls and sci-fi. A science fiction fan, Cole would often slip rocket ships and ray guns onto books such as 'Captain Flight' and 'Contact Comics' which were supposed to be devoted to contemporary aviation.

As for interior artwork, Cole did pencils and/or inks on several features for Holyoke Publications, Gilberton and Farrell. Cole also published comic books through Star Publications, producing various crime, terror, jungle and romance titles in the late 1940s and 1950s. He was art director and editor at Dell Publishing in the early 1960s. He has mainly done commercial art and design from the mid 1960s onwards, working among others on audio-visuals for University Films." - quote source

More on Cole can be found on his Wikipedia page.