Funnily enough, a few months ago I stumbled upon a very detailed account of Selden, his work, his patents and legal battles against his competitors:
Selden is another historical figure that some contemporary articles like to paint as a historical example of a "patent troll", but this account suggests otherwise. He does seem to be one of the earlier practitioner of "submarine" patents, although, if this account is accurate, he was so far ahead of his time that in his case it seems justified.
It's a fascinating read and has lots of old photos and newspaper clippings to go with the narrative. Although I haven't taken the time to verify its accuracy, it generally seems to gel with most of the document and photographic evidence included.