Who is the author credited with "The Undertaker's Manual," the first embalming textbook published in the U.S.?

The correct author credited with "The Undertaker's Manual," which is recognized as the first embalming textbook published in the United States, is Dr. Richard Harlan. His work was significant because it provided detailed guidance on the embalming process, which was essential for funeral service professionals at the time. Harlan's manual contributed to the establishment of embalming as a profession, offering practical techniques and theories that were instrumental in shaping modern embalming practices.

Other individuals listed have made notable contributions to various fields, such as Auguste Renounard, who also contributed to embalming literature later on, but Dr. Harlan’s publication is the one that holds the title of the first in the U.S. context, thus marking a pivotal moment in funeral service education.