Web Shiryo Sanshu（史料纂集）[Available through JapanKnowledge Lib]

Shiryo Sanshu (Collected Historical Materials), indispensable for research into Japanese history and culture, is a major collection of historical materials in which important works have been converted to modern-style Japanese script (reprint) for ease of use.
Based on the latest printed editions, the JK editions contain the full text data as page images and as pages converted to modern-style Japanese script. The texts can be browsed, searched and copied, and it is possible to obtain search results by narrowing searches to date, book name, era, and so on.

The following titles are available.
First phase : Kokiroku series, Heian/ Kamakura period, Namboku-cho period (Historiographical Institute Library Contract) 
Second phase : Kokiroku series, Muromachi/ Sengoku 1-3