数冊の

several books

→ 数冊
phrase Rare #27,279
several books 数冊 means several books or other bound volumes. 冊 is the counter used for books, magazines, and similar bound items, and の connects it to the noun that follows.
JA: 図書館から数冊の本を借りました。
EN: I borrowed several books from the library.

私は彼女から数冊の本をもらった

I got several books from her.

彼女は本棚にある数冊の本を彼に見せた

She showed him several books from the bookshelf.

彼は書店数冊の本を買った

He bought several books at the bookstore.

私は彼に数冊のを与えた

I gave him several books.

私はいつも手元に数冊の辞書をおいている

I always keep several dictionaries close at hand.

机の上に数冊の本がある

There are several books on the desk.