This document examines techniques for linking software commits to email discussions in low-tech code review environments. It evaluates three techniques - plus/minus line, checksum, and token-level - for accurately linking commits to the corresponding email containing a patch version (RQ1) and linking emails containing different patch versions (RQ2). The plus/minus line technique achieved the highest F-measure for linking commits to emails, while checksum had the highest F-measure for linking emails. The study also characterized code review histories in Linux kernel discussions (RQ3). It found that 25% of commits have hidden reviewing periods of over 4 weeks, larger patches are discussed over longer periods, and new threads are started if too