Value of book collection

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What would this book collection be worth ?

MagazinesExcellence - Issue #1 to #100
911 Porsche World (UK) - Issue #1 to #60
Christophorus - Oct/1970
Sept/1989 - Special Edition - F. Porsche 80th Birthday Issue)
Oct/1989 - 80th Birthday Present
Car Classics - The Porsche - Aug/1976
Road & Track Guide to Porsche - 1986
Road & Track Porsche Speedsters - 1990
Road & Track Porsche - 1989
European Car - Sept/1998 - 50 Year Tribute
European Car - Feb/1996 - 911S Special
Car & Driver - Feb/1972 - Testing the 2.4L Porsches
Sporting Classics - Issue #1 - 911/914-6

Hardcover BooksPorsche - Portrait of A Legend (Ingo Sriff)
Supercars - Porsche 911 (Kevin Blick)
Porsche - A History of Excelence (Mike McCarthy)
Porsche - The Pursuit of Excellence (Bill Reynolds)
Porsche Catalogues (Malcom Toogood)
Fantastic Porsche (Peter Vann)
Porsche - The Legend (Jonathan Wood)
Porsche - Excellence Was Expected (1st Edition) (Karl Lodrigsen)
The 911 & 912 Porsche - A Restorers Guide to Authenticity (Dr. B. Johnson)
Porsche Legends (Randy Leffingwell)
Porsche Buyers Guide (2nd Edition) (Dean Batchelor)
Porsche 911 Performance Handbook (1st & 2nd Editions) (Bruce Anderson)
Porsche Museum (1992)
Porsche Owners Workshop Manual (Haynes)
Porsche - Great Marques (Chris Harvey)
Porsche (Anders Ditler Clausager)
Porsche - Company Overview

BrochuresPorsche 911 Carrera/911 Turbo brochure (1988/89)
Porsche 911 Carrera2/911 Carrera4 (1990)

Special Items50 Years of Porsche Commemorative Case (VHS Video / Book)