Topical Studies for Numbers 21:21:
Amorites {Forerunner Commentary}
Amorites {Nave's Topical Bible}
Israel {Forerunner Commentary}
Israel {Nave's Topical Bible}
King {Forerunner Commentary}
King {Nave's Topical Bible}
Sihon {Forerunner Commentary}
Sihon {Nave's Topical Bible}