(1838 - 1914) ~ "John of the Mountains" and "Father of the National Parks", was an Influential Scottish-American[4][5]:?42? Naturalist, Author, Environmental Philosopher, Botanist, Zoologist, Glaciologist, and Early Advocate for Natural Preservation : An influential Scottish-American:?42? naturalist, author, environmental philosopher, botanist, zoologist, glaciologist, and early advocate for the preservation of wilderness in the United States of America. His letters, essays, and books describing his adventures in nature, especially in the Sierra Nevada, have been read by millions. (From : Wikipedia.org.)

Cultural Anthropologist, Anti-racism Advocate, Scholar of Race and Racism in Brazil and Rio De Janeiro, with a BA from Bard College and a PhD (1997) in Anthropology from the Graduate School and University Center of the City University of New York : A cultural anthropologist with a BA from Bard College and a PhD (1997) in Anthropology from the Graduate School and University Center of the City University of New York. Her previous work concerns race and racism in Brazil, with a focus on Rio de Janeiro. In documenting how racism is experienced by ordinary Brazilians of African descent, she contributed to a growing national discussion that led to significant policy changes in Brazil. (From : cola.unh.edu.)

(1873 - 1946) ~ Spanish Lawyer, Statesman, Minister of Development during the Reign of Alfonso XIII and Later was a Staunch Supporter of the Second Spanish Republic : A Spanish lawyer and statesman. He served as Minister of Development during the reign of Alfonso XIII and later was a staunch supporter of the Second Spanish Republic. He died in exile in Argentina. (From : Wikipedia.org.)

(1866 - 1966) ~ American Journalist, Author, French Sociologist, and Anthropologist of the Modern Working Class : An American journalist and author. He was known as a French conservative. While living abroad, he focused much of his writing on certain phases of French life. (From : Wikipedia.org.)

(1897 - 1939) ~ Social Critic, Anti-child Labor Activist, Prolific Writer, Editor, and Agitator for the Single Tax : A prolific writer, editor, and agitator for the single tax. Born in 1865, Miller was only 20 years old when he participated in Henry George?s first campaign for mayor of New York City in 1886. (From : HGArchives.org.)

"Family Limitation," by Margaret Sanger, 1918. Source: Family Limitation, 8th Edition , Lawrence Lader Papers, Houghton Library, Harvard University. Section: Introduction.

"Che's Last Letter: To the youth of the United States," by Abbie Hoffman, and published in The Realist, on April 1st, 1969. Quoted from The Portable Sixties Reader, edited by Ann Charters, a Penguin Classics.

"The Labor Movement and Socialism," by Anton Pannekoek, Source: International Socialist Review, July 1908, written for the Review, and translated by William E. Bohn.

"The Floodgates of Anarchy," by Stuart Christien and Albert Meltzer, PM Press, Oakland, California, 2010.

"The International Working Men?s Congress of 1889 - A Reply to Justice," by Eduard Bernstein, first published: as a pamphlet in 1889.