1. The Markoff and Lagrange Spectra Mathematical Surveys & Monographs
by Thomas W. Cusick 
Price: USD 26.98
Dealer: Biblio, Browsers' Bookstore
Description: American Mathematical Society, 12/31/Date: 1989 12:00:01. hardcover. Very Good. 0.6000 in x 10.3000 in x 6.9000 in. A nice copy. Clean text, solid binding. 1989. American Mathematical Society ISBN 0821815318 9780821815311 [US] 

2. The Markoff and Lagrange Spectra (Mathematical Surveys & Monographs)
by Thomas W. Cusick 
Price: USD 27.51
Dealer: Alibris, Browsers' Bookstore via Alibris
Description: American Mathematical Society 1989 UK ed. hardcover Very good A nice copy. Clean text, solid binding. 

3. The Markoff and Lagrange Spectra (Mathematical Surveys & Monographs)
by Thomas W. Cusick 
Price: USD 27.51
Dealer: Abebooks, Browsers' Bookstore, CBA
Description: ISBN10: 0821815318, ISBN13: 9780821815311, [publisher: American Mathematical Society] Hardcover A nice copy. Clean text, solid binding. [Albany, OR, U.S.A.] [Publication Year: 1989]  

4. The Markoff and Lagrange Spectra (Mathematical Surveys & Monographs)
by Thomas W. Cusick 
Price: USD 169.70
Dealer: AbebooksUK, dsmbooks
Description: ISBN10: 0821815318, ISBN13: 9780821815311, [publisher: American Mathematical Society] Hardcover Very Good [liverpool, United Kingdom] [Publication Year: 1989]