The following advertisers can be found on the back of Mendelsohn cards commonly referred to as m101-5:
Block and Kuhl Co. (card #s 1-20 only)
Famous and Barr Co. (card #s 21-200 only)
Gimbels (card #s 1-20 only)
Herpolsheimer Co. (card #s 1-20 only)
Holmes to Homes Milk Made Bread (all #s 1-200)
Morehouse Baking Co. (all #s 1-200, also all 200 are found in m101-4)
Standard Biscuit Company (all #s 1-200, also all 200 are found in m101-4)
Successful Farming (all #s 1-200-- plus 6 promo cards)

Numerous businesses used the M101-4 and M101-5 cards to advertise. Some use the M101-4 checklist while others used the M101-5 checklist. Some used a mixture of both.

Altoona Tribune
Block and Kuhl Store
Burgess-Nash Company
Everybody’s Boys Clothing
Famous and Barr Company
Gimbels
The Globe
Green-Joyce
Herpolsheimer Company
Holmes to Homes Milk Made Bread
Indianapolis Brewing Company
Mall Theatre
Morehouse Baking
None (blank backs)
Sporting News
Standard Biscuit Company
Successful Farming
Ware’s Basement
Weil Baking Company

The M101-5 set was actually released before the M101-4 set. Both sets were released after 1916.