The review states regarding the ANS's first medal, which was engraved by Emil Sigel, that

Actually, Franz Sigel was the eldest brother of the engraver Emil Sigel. The four Sigel brothers all came to the U.S. and, except for Emil, served in the Union Army during the Civil War. My paper on the Sigel family and the "Hero of Pea Ridge" Civil War token, which details all this, appeared in The Civil War Token Journal, Vol. 38, No. 2 (Summer 2004), pp. 3-10. This paper was awarded the CWTS first place literary award for 2004.

Incidentally, my great-great-granduncle Richard Montgomery Hubbell fought at the Battle of Pea Ridge, but on the Confederate side. He had been a newspaperman and was in charge of printing the newspaper for the troops at the time of the battle. He gave it the name "Battle of Elkhorn Tavern" after a local tavern at the site, and this became the name the Confederates used for the battle. I have a copy of Hubbell's memoirs in which he describes all this.

My point here isn't major, but given the long continuing confusion about the relationship between Franz and Emil Sigel I hate to see the error reinforced in this important new publication. Since I haven't seen the actual book yet, I don't know whether the cousin designation appeared in it or just in the review.

To read the earlier E-Sylum article, see:
BOOK REVIEW: MEDALLIC ART OF THE ANS, 1865-2014 (www.coinbooks.org/esylum_v18n30a09.html)