Officials of Encore and University Press said they expect to hire some of the displaced Mc-Graw-Hill workers.
McGraw-Hill closed in August, throwing 400 people out of work.
Plotnick said Encore officials will be at the Blue Ridge Summit site Friday to accept job applications. Encore will lease about 20,000 square feet from University Press. More workers will be added as business expands, he said.
"We're very excited about moving to Blue Ridge Summit," Plotnick said. "We looked around for a site in Pennsylvania." He said local and state economic development officials were helpful in the company's search.
"Between University Press and Encore many of the displaced McGraw-Hill workers will be back to work," said L. Michael Ross, president of the Franklin County Area Development Corporation.
Pennsylvania Gov. Tom Ridge, in a prepared statement Wednesday, said the job announcements are due to the state's work to attract companies to Pennsylvania.
"This has been a banner week as two world-class job creators will be providing job opportunities for 300 workers from Adams and Franklin counties," Ridge said.
Encore has a current work force of about 160 employees in its home office in Lanham, and its sales and accounting operations in Jacksonville, Fla., according to Plotnick. He said both facilities will stay where they are. "This is an expansion at Blue Ridge Summit," he said.
Plotnick said Encore has served more than 1 million customers since the company started business in 1978. It offers travel and hotel and rental car discounts plus home, garden and pet care products and services at discount prices. He said the company provides its customers with discounts at more than 5,000 hotels, including more than 1,000 that accept pets.
"We're a full-service travel agency for airline tickets, tours and cruises," he said
Encore markets its programs through affiliations with major issuers of credit cards, including banks, retail department stores and oil companies, he said.
University Press, publishers of academic books, also has headquarters in Lanham. That office plus the company's order filling and customer service operations in Savage, Md., will move to Blue Ridge Summit, company officials said. University Press bought the McGraw-Hill complex for an estimated $2.5 million.