Hi Bonnie, welcome to the forum. You're father was very talented.
I've copied the list of his contributions for 'Hosstail's' magazines from the Western Publications Index. TW= True West, FT= Frontier Times & OW= Old West. First number is the magazine issue and the second number is the page number. Hope it's of some help?
Bonnie thanks for the friend request. I have all the magazines listed bar True West #9, but I think most articles were reprinted in some early Old West issues. If there's anything I can help you with give me a holler.
Here's an illustration from True West #3 (Winter 1953)
Bonnie, I'm sorry to say I can't help you with any information on your father other than what I've gleaned from Hosstail's magazines. I really enjoyed reading the article "Folks Meet Randy Steffen" your father was quite a character. You might have better luck getting information on your father by starting a thread on the general forum as it's hidden away here on your profile page and most folks will probably miss it.