Joseph Dietzgen

Major works by Joseph Dietzgen, the philosopher introduced by Marx to the First International as the philosopher of our movement;

1. Das Wesen der menschlichen Kopfarbeit, 1869, engl "The Nature of Human Brainwork",
2. "The Religion of Social Democracy" (in six sermons from 1870–1875).
3. "Scientific Socialism" (1873).
4. "The Ethics of Social Democracy" (1875).
5. "Social Democratic Philosophy" (1876).
6. "The Inconceivable: a Special Chapter in Social-Democratic Philosophy" (1877).
7. "The Limits of Cognition" (1877).
8. "Our Professors on the Limits of Cognition" (1878).
9. "Letters on Logic" (addressed to Eugen Dietzgen) (1880–1884).
10. "Excursions of a Socialist into the Domain of Epistemology" (1886).
11. "The Positive Outcome of Philosophy" (1887).

Here' what Librivox has

1. NO - Das Wesen der menschlichen Kopfarbeit, 1869, engl "The Nature of Human Brainwork",
2. NO - "The Religion of Social Democracy" (in six sermons from 1870–1875).
3. NO - "Scientific Socialism" (1873).
4. NO - "The Ethics of Social Democracy" (1875).
5. NO - "Social Democratic Philosophy" (1876).
6. NO - "The Inconceivable: a Special Chapter in Social-Democratic Philosophy" (1877).
7. NO - "The Limits of Cognition" (1877).
8. NO - "Our Professors on the Limits of Cognition" (1878).
9. NO - "Letters on Logic" (addressed to Eugen Dietzgen) (1880–1884).
10. NO - "Excursions of a Socialist into the Domain of Epistemology" (1886).
11. NO - "The Positive Outcome of Philosophy" (1887).

So to break it down into chapters

1. Das Wesen der menschlichen Kopfarbeit, 1869, engl "The Nature of Human Brainwork",
2. "The Religion of Social Democracy" (in six sermons from 1870–1875).
3. "Scientific Socialism" (1873).
4. "The Ethics of Social Democracy" (1875).
5. "Social Democratic Philosophy" (1876).
6. "The Inconceivable: a Special Chapter in Social-Democratic Philosophy" (1877).
7. "The Limits of Cognition" (1877).
8. "Our Professors on the Limits of Cognition" (1878).
9. "Letters on Logic" (addressed to Eugen Dietzgen) (1880–1884).
10. "Excursions of a Socialist into the Domain of Epistemology" (1886).
11. "The Positive Outcome of Philosophy" (1887).