The books below are a suggested reading list to learn more about the people and history of Pitkin County, Colorado.

You should be able to obtain most of these books through interlibrary loan for free or a very nominal fee.

Famous Aspen, by Caroline Bancroft, The Golden Press 1954
Aspen: Dreams and Dilemmas, by Peggy Clifford, The Swallow Press 1970
To Aspen and Back, St. Martin's Press 1980
The Aspen Idea, by Sidney Hyman, Norman: University of Oklahoma Press 1975
"Horsethief Kelley" and his Camera, by Janet Landry and Joan Lane, 1972
Aspen, The Quiet Years 1910-1930, by Jim Markalunas
The Aspens, edited by Jamie Marshall, The Aspen Skiing Company 1989 
The Aspen Story, by John and Frankie O'Rear, A.S. Barnes 1966 
Aspen & The Roaring Fork Valley, by Sarah J. Pearce and Roxanne Eflin, Cordillera Press 1990
Aspen, The History of a Silver Mining Town, by Malcolm J. Rohrbough, Oxford Press 1986
Oh Be Joyful! An Historic Tale of Aspen Silver Camp, 1975
The Historical Hotel Jerome, 1986
Aspen on the Roaring Fork, by Frank L. Wentworth, Sundance Ltd. 1976
Aspen's Early Days, a Walking Tour, by Aspen Historical Society Heritage Series, Vol 1 by Heather Hopton and Lilo Shuldener 1975. 75 pp with photos and map, this book shows how it was and who was there. 
Pioneers of the Roaring Fork, by Len Shoemaker, 1965 hb w/ dj. Sage Publishing Denver Colorado262pp. The Aspen area, including some biographies of early pioneers, railroad and mine stories with colorfol local lore and stories.
The Lion of Redstone, by Sylvia Ruland, Call Number ISBN 0-933472-55-2, Johnson Publishing Company, Boulder CO 1981, a biography of John Cleveland Osgood
The Hidden Place : Redstone, by Norma Kenney ; Winifred Kitts and Ken Johnson, editors. Call Number C978.843 K395hi Publisher [Redstone, Colo.?] : Redstone Press, 1992. Description 94 p., [1] folded leaf of plates : ill., maps, ports. ; 221 cm. Notes "July 1992." 
The Story of Redstone, Colorado, by prepared by Pat R. Zollinger and Charles E. Osgood. Author Zollinger, Pat R. Call Number C978.843 Z753st Publisher Denver, Colo.: Viking Enterprises, c1964. Description 8 p. : ill., maps ; 22 cm. Notes Title from cover. 
Ghosts of Pitkin County : a Guide to the Ghost Towns and Mining Camps of Pitkin and Northern Gunnison Counties, Colorado, by John K. Aldrich. Call Number 917.884104 A356gh 1992 Publisher Lakewood, Colo. : Centennial Graphics, c1992. Description 60 p. : col. ill. ; 22 cm. + 1 map (41 x 46 cm. folded to 21 x 13 cm. 
Marble, Colorado: City of Stone, by Duane Vandenbusche and Rex Myers. Call Number 978.84103 V281ma C978.84 G956va Publisher Denver, Golden Bell Press [c1970] Description vii, 221p. illus., map (on lining papers) 23cm. 
The Fabulous Valley: Some Facts and Conjectures about the Crystal River Valley in Colorado, by Alvin Foote. Call Number 978.841 F739fab Publisher New York, A. & T. Co., c1950. Description 39 p. illus., map.