Do yourself a favor and read The Concept of Nature in Marx and History and Structure.
Some people have launched a project to translate more of his work. I wish he had at least outlasted Habermas.
communist interventions readers
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Bay Area Public School
(Project of the Historical Materialism Series at Brill)
...on Marx, Gramsci and the state
Fault Lines of Capital Accumulation & Front Lines of Class Struggle
on economics, culture and society
An online resource.