A free computer searchable PDF copy of Piepkorn’s seminal The Conduct of the Service (1965) is available now by contacting email@example.com. It will be down-loadable from Piepkorn.org as soon as I can arrange that.
It can also be purchased in a hardcover book from http://www.redeemerfortwayne.org/conduct.php.
Charles McClean’s The Conduct of the Services — note the plural — is about celebrating Holy Communion with the priest facing the congregation and is also available in that book. Note that we now know that Martin Luther was wrong when he wrote that in the early centuries altars were free standing and concluded that the celebrant stood behind the altar facing the people. In the early church most, but not all, altars were free standing. But prayer was to made to the east, so the celebrant would have stood in front of the altar not behind it. To this very day altars among the Eastern Orthodox are free standing, but the celebrant faces in the same direction as the people when he stands at the altar. This is clearly very ancient usage. McClean wrote an excellent article about this that was published in Logia in about 2013 or 2014. Some were; but not all. McClean wrote an excellent article about this that was published in Logia in about 2013 or 2014.