ABBREX

• 641. Promotion (1)
• 642. Protocols (29)
• 643. Psychiatry (10)
• 644. Psychology (11)
• 645. Psychotherapy (1)
• 646. Publications (4)
• 647. Publishers (1)
• 648. Publishing (5)
• 649. Purchase (1)
• 650. Python (1)
• 651. Racing (3)
• 652. Radio (15)
• 653. Radio Astronomy (2)
• 654. Radio Control (2)
• 655. Rating (1)
• 656. Rc-shop (4)
• 657. Real Estate (2)
• 658. Rebels (1)
• 659. Record (1)
• 660. Red Hat (4)

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Numbers in parantheses show the number of abbreviations with that tag.