Opening the Hand of Thought, Uchiyama.
The Kyosakua and Mokurai, Matsuoka, Soyu. Collections of talks. hard to find. Amazon.
Zen Mind, Beginner’s Mind, Suzuki, Shunryu. A classic.
Soto Zen, Global Soto Zen Net. Pamphlet. a good place to get an overall picture of Soto Zen.
Living by Vow, Okumura, Shohaku. Very clear translator and Soto teacher