That Simon Miller rifle is on page 23 of the book.
One of the horns on display is also in the book, page 57"
"Ebenezer Polley His Horn 1776 Made in New York by E. P.
"Ebenezer Polley's horn of 1776 has incorporated the saying, "I POWDER WITH MY BROTHER BAWL USE ME RITE AND KELT THAM ALL". This inscription, and its numerous variants, was a favorite saying of the period, for it appears on a number of horns"
On page 71 it reads " Additional contemporary firearms are currently in storage, and will be exhibited on a rotating basis.