Today a fresh I-D was published, titled: "Host/Host Protocol for the ARPA Network" from Alexander McKenzie and Steve Crocker; covering Internet history. Great I-D:

This document reproduces the Host/Host Protocol developed by the ARPA Network Working Group during 1969, 1970 and 1971. It describes a protocol used to manage communication between processes residing on independent Hosts. It addresses issues of multiplexing multiple streams of communication over a single hardware interface including addressing, flow control, connection establishment/disestablishment, and other signaling. It was the official protocol of the ARPA Network from January 1972 until the switch to TCP/IP in January 1983. It is offered as an "intended RFC" at this late date to help complete the historical record available through the RFC series.