were distributed under the name SPACWR.</para>
<para>Many different versions radiated from Mayfield's original; most
-og the ones in BASIC are descended from a SPACWR version that David
+of the ones in BASIC are descended from a SPACWR version that David
Ahl published in <citetitle>101 BASIC Computer Games</citetitle>,
July 1973. This was a port of Mayfield's version obtained from the HP
Contributed Programs library. </para>