21. The dust cover of his book, " On Book Design ", features the Van de Graaf canon. 22. The cocking handle is on the left side of the upper receiver incorporated with a dust cover . 23. This is now rare, and a mint copy with a dust cover is worth hundreds of pounds. 24. Empty casings are ejected out of the ejection port on the right which has a hinged dust cover . 25. Empty casings are ejected out of the ejection port on the right, which has a hinged dust cover . 26. :: I think it should be moved to Dust cover ( firearms ) which I have just done. 27. Keyboard and computer dust covers ( about $ 5 for keyboards and $ 15 for system or printers ). 28. This was also one of the first sub-machine guns that had an integral dust cover on the magazine housing. 29. The original XA's dust cover dome resembled a flattened oval, whereas the other models had a more rounded design. 30. The Doubleday dust cover copy makes Payne's target clear : " With a hint of Salinger . . ."