What was advertised in a colonial American newspaper 250 years ago today?

“Those who have taken subscriptions of others, [send] their lists … to the Publisher.”
In the course of just a few days late in the summer of 1771, readers in New England, New York, Pennsylvania, and South Carolina encountered the same advertisement in their local newspapers. John Dunlap, a printer in Philadelphia, distributed subscription notices for his current project, “ALL THE POETICAL WRITINGS, AND SOME OTHER PIECES, of the Rev. NATHANIEL EVANS,” in order to entice customers in distant places to reserve copies of the forthcoming work. On September 2, Dunlap’s advertisement ran in the New-York Gazette and Weekly Mercury, the Pennsylvania Chronicle, and the South-Carolina and American General Gazette. Four days earlier, the same advertisement ran in the Massachusetts Gazette and Boston Weekly News-Letter and the Pennsylvania Journal.
With one exception, the advertisements featured identical copy with minor variations in format, the copy being the domain of the advertiser and decisions about design at the discretion of the compositor. The exception concerned the directions issued to prospective subscribers for submitting their names. In the newspapers published in Philadelphia, Dunlap requested “that all who are desirous of encouraging this publication, and who may not yet have subscribed, will send their names” to him directly. In addition, he asked that “those who have taken subscriptions of others,” acting as agents on Dunlap’s behalf, dispatch “their lists without loss of time to the Publisher.” In the advertisements in the other newspapers, however, he instructed subscribers to submit their names “to the Printer hereof.” Newspaper printers in other cities served as his local agents, including Richard Draper in Boston and Hugh Gaine in New York. Robert Wells, printer of the South-Carolina and American General Gazette, underscored that he was Dunlap’s local agents, revising the copy in his newspaper to instruct subscribers to “send in their Names, without Loss of Time, to ROBERT WELLS.”
Dunlap did not rely merely on generating demand among local customers when he published “THE POETICAL WRITINGS … of the Rev. NATHANIEL EVANS.” Instead, he inserted subscription notices in newspapers published in the largest cities in the colonies, hoping to incite greater interest in the project and attract additional buyers. In the process, he recruited other printers to act as local agents who collected subscriptions on his behalf. He created a network of associates that extended from New England to South Carolina as part of his marketing campaign.