Lou Marchetti

Title: The Nurse with the Silver Skates
Author: Virginia McDonnell
Publisher: Ace
Published: ©1964
Illustrator: Lou Marchetti 

He is not credited, but this is very much in his style.

Inga Larsen, showing a newborn babe to its father, a baby she had helped to deliver …
Inga Larsen, soaring through the air on ice skates amid the gasps of thrilled spectators …
Which was she, student nurse or rink champion? And which was the right man for her? Scott Marshall, ice-skating master, idol of her childhood, or Dr. Thor Eriksen, whom she had secretly loved for three years? Inga Larsen just did not know, and both men were not making it any easier for her to find out!

Mort Engel

Title: Log Camp Nurse
Author: Arlene J. Fitzgerald
Publisher: Avon
Published: December 1966, ©1966
Illustrator: Mort Engel

He is credited on the copyright page.

Beautiful Tove Jensen was reared in a lumber camp, but after nursing school she moved to Cosmo Beach at the center of the movie industry. There she found love for the first time. A tragic accident called her back to the lumber camp where she met Dr. Bryden. Then she was torn between two loves. Would it be the courageous lumber camp doctor or the handsome California M.D.? The decision would forever alter her life.