6 books in series

Springer Undergraduate Mathematics Series

Springer Undergraduate Mathematics Series is a 6-book series with 6 released primary works first released in 2005 with contributions by Martin D. Crossley, Jeremy Gray, David F. Griffiths, Desmond J. Higham, Alan Camina, Barry Lewis, Luis Barreira, Claudia Valls, and Christopher Norman.

An Introduction to Enumeration
Complex Analysis and Differential Equations
Finitely Generated Abelian Groups and Similarity of Matrices over a Field
Worlds Out of Nothing: A Course in the History of Geometry in the 19th Century
Essential Topology
Numerical Methods for Ordinary Differential Equations: Initial Value Problems