January 7, 1951 Based on events of August 27, 1938. A dead body is found in a duffle bag in an empty freight car. 

Episode 121 aired December 14, 1944 on CBS Radio Network. Starring Robert Montgomery. A couple suspects that their lodger is really "The Avenger," a homicidal maniac. In 1888, London is terrorized by the fifth in a succession of recent murders.

STAN FREBERG PRESENTS THE UNITED STATES OF AMERICA. Ben Franklin discusses discovery of electricity, in stereo.

Episode 24 aired March 7, 1954 on NBC Radio Network. James Stewart rode the radio range from September 20, 1953, through June 24, 1954, as Britt Ponset. Two bandits hit on Britt who is mistaken for someone else resulting in a few minutes of gunplay.

September 4, 1952 -  A gang of bandits is trying to find one steer in a herd. It has a fortune in stolen diamonds hidden in a hollowed horn.

Episode 14 aired on the CBS Radio Network on Sunday evening October 13, 1957. The Stan Freberg Show was a weekly radio comedy show that ran on the CBS Radio Network for fifteen episodes in 1957 from July 14 through October 20. The show, starring comedian Stan Freberg and featuring the vocal talents of Daws Butler, June Foray and Peter Leeds, Peggy Taylor as the resident singer, and the musical direction of Billy May. The show aired in the 7:30 p.m. (ET) time slot following repeats of The Jack Benny Program {"The Best Of Benny"} on Sundays.  

Aired April 8, 1947. Richard Kollmar stars. Blackie and the cops find the body of one of the wealthy Rodgers sisters in their junk-filled house.

https://en.wikipedia.org/wiki/Boston_Blackie

Episode 4 aired February 27, 1950 on NBC Radio. Joan Banks stars Randy Stone, played by Frank Lovejoy, meets Fran Fowler in the park. She's a nightclub singer with a serious problem. Joan Banks (October 30, 1918 – January 18, 1998) was an American film, television, stage, and radio actress (described as "a soapbox queen"), who often appeared in dramas with her husband, Frank Lovejoy.  https://en.wikipedia.org/wiki/Joan_Banks

Excerpt from an NBC Radio broadcast on December 7, 1941. Hans von Kaltenborn (July 9, 1878 – June 14, 1965), generally known as H. V. Kaltenborn, was an American radio commentator. He was heard regularly on the radio for over 30 years, beginning with CBS in 1928 and NBC in 1940. He was known for his highly precise diction, his ability to ad-lib, and his depth of knowledge of world affairs. Kaltenborn had very specific views about radio's role in presenting the news. Later in life he wrote on the subject in many of his books. He was one of four journalists who portrayed themselves in the 1951 film The Day the Earth Stood Still. Kaltenborn also appears as himself in the 1939 Frank Capra film Mr. Smith Goes to Washington.  https://en.wikipedia.org/wiki/H._V._Kaltenborn

Aired August 8, 1956 an encapsulated highlights of NBC radio shows on the evening of Friday, March 4, 1938. Featuring Amos N' Andy with Walter Huston, Frank Black's Orchestra, Los Angeles rainstorm news, Abe Lyman's Waltz Time, Jimmy Fiddler From Hollywood and a big band radio remote with the Blue Barron Orchestra.