Upper Mississippian and Pennsylvanian megaspores and other plant microfossils from Illinois Q Science
The Philosophical transactions of the Royal society of London, from their commencement in 1665, in the year 1800 Q Science
Gesammelte Abhandlungen. Unter Mitwirkung von Andreas Speiser und Hermann Weyl; hrsg. von David Hilbert Q Science
A treatise on the calculus of variations. Arranged with the purpose of introducing, as well as illustrating, its principles to the reader by means of problems, and designed to present in all important particulars a complete view of the present state of the science Q Science
