This is Volume II in The Complete Works of Karl Marx by NL Press.
Written across the years 1845 & 46, this collection of writings by Marx and Engels were published in the early 20th century from his estate. The bulk of these were written by Marx but some parts by Engels, Moses Hess, Joseph Weydemeyer and Roland Daniels. Die deutsche Ideologie is considered a key work in the development of historical materialism. Engels noted that this work contained his first sketch of Historical Dialectical Materialism, although you see elements of this in his 1841 "Differenz der demokritischen und epikureischen Naturphilosophie", his doctoral thesis, and his early criticisms of Hege's Philosophy of Right, his 1844 "Zur Kritik der Hegelschen Rechtsphilosophie".