BOOKSHELF A: I will need 2 units in this style
3 shelves tall, 22 inches wide
(see yellow highlighted shelf in image)

Exterior dimensions are: 
     Height: 44.25"
     Width: 22"
     Depth: 11.25"
Interior shelf dimensions are as follows for all 3 shelves:
     Height: 14.25"
     Width: 21"
     Depth: 11"

BOOKSHELF B: I will need 10 units in this style:
2 shelves tall, 22 inches wide
(see pink highlighted shelf in image)

Exterior dimensions are:
     Height: 30"
     Width: 22"
     Depth: 11.25"
Interior shelf dimensions as follows for both shelves:
     Height: 14.25"
     Width: 21"
     Depth: 11"

BOOKSHELF C: I will need one unit in this style
3 shelves tall, 12 inches wide (same depth and width as Parker, but 3 shelves tall)
(see green highlighted shelf in image)

Exterior dimensions are:
     Height: 44.25"
     Width: 12"
     Depth: 11.25"

Interior shelf dimensions as follows for all 3 shelves:
     Height: 14.25"
     Width: 11"
     Depth: 11"