Professor Bodiford's previous post in the "tachi exports" thread is a good summary of the texts and sources available on the topic. He consistently offers some of the best and more well-informed posts on this forum. However, I would like to clear up a couple of inaccuracies, before they create confusion.
The author of the Dadaofa xuan was Cheng Zongyou (—Q), not Cheng Zongxian (Œ£). The characters are similar. Perhaps there is a typo in Prof. Bodiford's source?
Although Wu Shu does give techniques and critiques of various weapons, his Shoubei lu and its two appendices are devoted primarily--almost obsessively--to spearmanship. It is a detailed and valuable contemporary resource on the topic, and we are lucky it survived.