There’s a lot of tweed, a couple of pocket squares and an old-fashioned waxed mustache in “The Booksellers,” D.W. Young’s charming documentary about the book world — or more specifically the book-as-object world, with antiquarian booksellers trying to reinvent themselves and their industry in a digital era.

Anybody curious about the inner workings of unglamorous behemoths like Amazon or the ailing Barnes & Noble will have to look elsewhere. Young made the aesthetically wise choice to focus mainly on purveyors specializing in rare books or niche subjects. Some are inveterate collectors themselves. One bookseller gives a tour of his warehouse in New Jersey, where 300,000 volumes share space with taxidermied sea gulls and a masonic throne.