Fine Tuning of the Text

The following should be used to improve the readability of the text:
;SPMnbsp;56 a thin space, e.g. between numbers or between units and numbers; a line division will not be made following this space
;SPMnbsp;57 en dash; two strokes, without a space at either end
;SPMnbsp;1 en dash; two strokes, with a space at either end
;SPMnbsp;58 hyphen; one stroke, no space at either end
;SPMnbsp;59 minus, in the text only
;SPMnbsp;Input 60
;SPMnbsp;;SPMnbsp; 61
;SPMnbsp;;SPMnbsp; 62
;SPMnbsp;;SPMnbsp; 63
;SPMnbsp;;SPMnbsp; 64
;SPMnbsp;;SPMnbsp; 65
;SPMnbsp;Output 21;SPMnbsp;oC etc., Dr h.;SPMnbsp;c.;SPMnbsp;Rockefellar-Smith ...
;SPMnbsp;;SPMnbsp; 20,000;SPMnbsp;km and Prof.;SPMnbsp;Dr Mallory ...
;SPMnbsp;;SPMnbsp; 1950--1985 ...
;SPMnbsp;;SPMnbsp; this -- written on a computer -- is now printed
;SPMnbsp;;SPMnbsp; -30;SPMnbsp;K ...