I also have several ancestors who, while not famous, were fairly well known at the time and who were often mentioned in newspapers, academic articles and books. Like you, I periodically Google them to see if anything new has come up. I just did a check on one of them ["Robert W. Logan" Micronesia] and got the usual sort of hits that I always get.
I also did a Google search for your man ["J W Allen" +Longmans -Shakespeare] and got nothing. But when I did the same search without the + and - signs, I got results. So, I checked "Robert W. Logan" +Micronesia and got nothing. There seems to be something about that + sign that is throwing things off.
Edited to add: And I'm glad you asked that question because, while looking at the Robert W. Logan results, I did find something new and quite interesting - a Master's thesis on missionary ships which informed me that Robertīs son Arthur (age 13) was on the maiden voyage of the missionary packet Morning Star IV in 1884 when it sailed from the shipyard in Maine down to the Straits of Magellan and then up to Hawaii. I knew that Arthur had joined his parents in the Pacific in 1884, but I didn't know that he had gone via Tierra del Fuego; I had always just assumed that he sailed from San Francisco.