[time-nuts] Springer textbooks >10 years old now available for download as PDF at no cost

[Gregory Maxwell]

The Quantum Beat
http://link.springer.com/book/10.1007/978-1-4757-2923-8

Frequency Standards and Metrology
http://link.springer.com/book/10.1007/978-3-642-74501-0

Frequency Measurement and Control
http://link.springer.com/book/10.1007/3-540-44991-4

(and, many many other books on control theory, and other time-nuts
relevant works.)