There is an excellent site discussing various issues with eruvin, many of them contemporary (especially in light of the seforim which have been published on the topic in the last couple of years, many dealing with the Brooklyn controversy). Today, he has the second part of his series on the St. Louis eruv controversy which includes a rather fascinating discussion regarding two seforim printed at the turn of the 20th century.

Both of those seforim are available online, if one is interested in reading further.