specialist newspaper; trade journal
Refers to a newspaper or periodical focused on a specific industry, field, or profession, as opposed to a general-interest newspaper.
He works as a reporter for a medical trade journal.
You can check trends in this industry in specialist newspapers.
業界紙 is a trade paper specifically for a business sector; 専門紙 can also cover academic or technical fields.
Compound of 専門 (せんもん, 'specialty') and 紙 (し, 'paper/newspaper').