Reform Literature

Abolition Meeting Held at Willis' Rooms in Honor of Harriet Beecher Stowe (1853)

Here are a few titles available on-line for American (and some British) radical left-wing causes of the 1840s-60s.

Abolition
Narrative of the Life of Frederick Douglass, an American Slave by Frederick Douglass (1852)
Uncle Tom's Cabin by Harriet Beecher Stowe (1852)
An Appeal to the Christian Women of the South by Angelina Grimke (1836) Also here.
Autobiography of a Female Slave by Martha Griffith Browne (1856)
Incidents in the Life of a Slave Girl by Harriet Ann Jacobs (1861)
Annual Report of the American Anti-Slavery Society (1861)
The Constitutional Duty of the Federal Government to Abolish American Slavery (1855)
The Abolition of Slavery by William Lloyd Garrison (1861)
Colonization and Abolition by J. H. B. Latrobe (1852)
The Philosophy of the Abolition Movement by Wendel Philips (1860)
A Dissertation on Slavery; With a Proposal for the Gradual Abolition of it, in the State of Virginia (1861)
Slavery: Letters and Speeches by Horace Mann (1855)
The Unconstitutionality of Slavery by Lysander Spooner (1860)
Miscellaneous Writings on Slavery by William Jay (1853)
The Slavery Question by John Lawrence (1854)
The Anti-Slavery Movement: A Lecture by Frederick Douglass (1855)
The Anti-Slavery Alphabet by Hannah and Mary Townsend (1847)
Slavery vs. Abolition (1860) [An opposing view, see also Anti-Abolition Tracts (1863) and Abolition and Secession (1862)]

Women's Rights (Property and Suffrage)
The Responsibilities of Woman by Clarina Nichols (1851)
Woman's Rights Tracts by Wendell Phillips, et al. (1841)
Proceedings of the National Women's Rights Convention (1854)
Proceedings of the Women's Rights Convention Held at West Chester, PA (1852)
A Scriptural View of Women's Rights and Duties (1849)
The Condition, Influence, Rights, and Appeal of Women (1845)
A Treaty on the Legal and Equitable Rights of Married Women by William H. Cord (1861)
A Book For The Times: Lucy Boston; Or Women's Rights and Spritualism (1855) [An opposing view; for more, see Punch]

Dress Reform ("Bloomer", "Reform Dress", "American Costume")
Dress Reform by Ellen Beard Harman (1862)
"Female Dress in 1857" in The Foreign Quarterly Review
Report of the Proceedings of the Third Annual Meeting of the National Dress Reform Association (1858)
"More Testimony for the Bloomer" in Heath: A Home Magazine (1853)
"Dress for the Garden, etc." in The American Agriculturalist (1863)
"The American and French Fashion Contrasted" in The Water-Cure Journal (1851)

Temperance
Ten Nights in a Barroom and What I Saw There by T. S. Arthur (1855)
Temperance Pamphlets (1841)
The Triumphs of Temperance: A Discourse (1855)
First Words on Temperance: A Lecture by Rev. Robert Maguire (1861)
The Temperance Cause: Past, Present and Future (1865)
Illustrated Temperance Tales by T. S. Arthur (1850)
The Youth's Temperance Lecturer by Dr. Charles Jewett (1861)
The National Temperance Magazine (1850)
Temperance and Total Abstinence by Spencer Thomson (1850)
Temperance: A Sermon by W. P. Tilden (1856)
Tracts: Prize Tracts from the Scottish Temperance League (1850) are all 4 pages long, and easy to print out in pamphlet form (they were also re-printed in 1861).  There's also the Edinburgh (1854) and Ipswich (1865) temperance tracts

Health Fads (Water Cures, Diets)
The Water-Cure Journal (1852, 1853, 1854, 1863)
The Water Cure; Applied to Every Known Disease by J. H. Rausse (1850)
Hydrotherapy, or The Water Cure by Joel Shrew (1851)
The Water Cure Manual by Joel Shew (1852)
"The Science of Diet" in The People's Review (1850)
Vegetable Diet by William Alcott (1859)
"Graham's Lectures on the Science of Human Life" in The Eclectic Journal of Medicine  (185)
The Vegetarian Advocate (1848)
The American Vegetarian & Health Advocate (1850)
The Vegetarian Messenger (1851)
Proceedings of the Eleventh Annual Meeting of the American Vegetarian Society (1860)
Principles and Practice of Vegetarian Cookery by John Smith (1860)

Songs and Plays
Seven Night in a Barroom [A Temperance Entertainment] (1863)
Temperance Song Book (1841)
The Temperance Melodeon (1850)
The National Temperance Songster (1853)
Thompson's Band of Hope Melodies (1860)
The Anti-Slavery Harp (1846)
Anti-Slavery Songs (1849)