Archive.org has many excellent scanned publications relating to almost everything. Here are a few steam car ones.
Story of the automobile, its history and development from 1760 to 1917, with an analysis of the standing and prospects of the automobile industry 1917
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archive.org]
Automobile engineering: a general reference work
by American Technical Society 1917
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archive.org]
Horseless vehicles; automobiles, motor cycles operated by steam, hydro-carbon, electric and pneumatic motors; a practical treatise for ... everyone interested in the development, use and care of the automobile, including a special chapter on how to build an electric cab, with detail drawings 1900
by Hiscox, Gardner Dexter
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archive.org]
The Automobile magazine 1899
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archive.org]
Cyclopedia of automobile engineering; a general reference work on the construction, operation, and care of gasoline, steam, and electric automobiles, instruction in driving, commercial vehicles, motorcycles, motor boats aerial vehicles, self-propelled railway cars, etc 1910
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archive.org]
The Horseless age 1895
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archive.org]
Scientific American Volume 86 Number 09 (March 1902)
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archive.org]
Self-propelled vehicles; a practical treatise on the theory, construction, operation, care and management of all forms of automobiles 1904
by Homans, James E. (James Edward),
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archive.org]
The Florida Auto Annual 1905
by Foster & Reynolds Co.
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archive.org]
Automobile Topics 16 1908-1909
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archive.org]