Issues 601-610 are really not modified comic book covers at all. They are Vaingirls Comics covers made from scratch using illustrations done by American commercial artists of the 20th century.  The pics, except for 609 & 610, came from the American Art Archives website. Click on "Artist Bios and Artwork."  The site is worth a look!  Let me know what you think of this type of work as opposed to using actual comic covers.

Hugs and enjoy.

Jezzi Belle Stewart