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You are looking at an original 18th century book bound in full contemporary vellum

Sanctissimi Domini Nostri Benedicti Papae XIV. De Synodo Dioecesana Libri Tredecim. In Duos Tomos Distributi. 
Tomus Secundus
Rome 1767, 335 pages + 60 page index, measures 215mm x 290mm

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increasingly uncommon after 247 years
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