41.   How deeply the shelves should be set into the sides has a lot to do with how the sides are secured.

42.   In addition to the desk there was a shelf, a phone jack for private calls and e-mail, a streamlined solid-state reading light and an adjustable ventilation unit.

43.   In her study are several shelves of works by her friend Graham Greene.

44.   In one of the few grocery stores still functioning here, half the shelves are empty.

45.   In several towns, grocery shelves are bare, the water undrinkable.

46.   In the markets, shelves are now full and prices for some staples have dropped.

47.   Incidentally, the shelves should be set into the sides with shouldered dadoes, rather than full dadoes.

48.   Inside, shelves are orderly, arranged.

49.   Most library shelves are empty.

50.   Now adjust the second standard until the shelf is level.