51. Image Clarity
by John B. Williams 
Price: USD 38.34
Dealer: Alibris, Media Smart via Alibris
Description: Elsevier 1989 HARDBACK New P 224. 

52. Image Clarity
by Williams John B. 
Price: USD 35.34
Dealer: AbebooksUK, Majestic Books
Description: ISBN10: 0240800338, ISBN13: 9780240800332, [publisher: Elsevier] Hardcover pp. 224 [Hounslow, United Kingdom] [Publication Year: 1989]