Hello r/askhistorians! I'm and undergraduate history major who has recently discovered a massive interest in medieval Japanese history. I'm considering doing my senior thesis on it, with a specific interest in Kamakura-era Japan and I hope to get to grad school for it. One of the major roadblocks is I do not speak Japanese, and I have started teaching myself, though I won't be able to become fluent enough to read documents in the original Japanese before I'm done. I'm interested to see if there are translated sources out there I may have missed.
What I have found so far: I've got Shinoda's translations of the azuma kagami from The Founding of the Kamakura Shogunate 1180-1185. I've got Mass' The Development of Kamakura Rule, 1180-1250: A History with Documents and The Kamakura Bakufu: A Study in Documents with his translations of mostly land records. I've also accessed Berkeley's Japanese Historical Text Initiative at https://jhti.berkeley.edu/index.html and I've looked through some of the translated texts in there, like the Gukansho.
I'd appreciate it if anyone could point me towards any other translated primary sources- diaries or more official documents or letters or anything like that! My primary interest lies in political and social history during the Kamakura bakufu. Thank you!
I'm not very knowledgeable about the Kamakura period, but I think you should take a look at Thomas D. Conlan's "In Little Need of Divine Intervention. It's a full black-and-white reproduction and translation, along with an interpretive essay, of Takezaki Suenaga's Scrolls of the Mongol Invasions of Japan. Conlan was a student of Mass, so his work builds on your readings of Mass.
Takezaki himself fought against the Mongols and wrote the scrolls around the end of the 13th century. Conlan goes into full detail about the dating, origin, changes to the scrolls etc.