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Depending on how much early rocket background you want to read, other possible sources (free, online PDFs) for early rocket engine development are:

Pursuit of Power

NASA’s Propulsion Systems Laboratory No. 1 and 2

Pursuit of Power

 and:

To Defend and Deter US Cold War Missiles

On the nuclear rocket program:

NASA Nuclear Frontier-The Plum Brook Reactor

and:

NASA Nuclear Rocket Program

and:

Nuclear Rocket Tests

and on the Russian side

Rockets and People.  4 volumes as PDFs:

Rockets and People

and Rocket Engines from the Glushko Design Bureau

Siddiqui- Glushko engines