The HathiTrust Digital Library contains full-text scans of three Rosa Luxemburg classics. Two U.S. editions of the Junius pamphlet are available, as well as the first U.S. edition of her critique of the Russian revolution. The latter was translated by Bertram Wolfe and published in 1940 by Workers Age, the Lovestoneite publishing house. In addition, a beautiful 1921 English-language edition (published in Berlin) of a selection of her prison letters to Sophie Liebknecht is available.

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The Crisis in the German Social Democracy (also known as the Junius Pamphlet)

1918 edition, misattributed to Luxemburg, Karl Liebknecht, and Franz Mehring
(Scan from the collection of University of Michigan)

1919 edition, with correct attribution
(Scan from the collection of the University of California)

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The Russian Revolution
(Scan from the collection of University of Michigan)

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Letters from Prison

Although the title pages mentions a portrait, the book as scanned does not seem to contain one.
(Scan from the collection of the University of California)

All four titles are in the public domain. Those affiliated with one of the HathiTrust participating institutions can download the full PDF scan. Everyone else can view the full content, page by page.