Misc: In 1977 First TV viewer discretion warning - "---------- ". ?

Questions

what was the name of the horse ridden by spanish leader "el cid"??

which one of the monkees played a circus boy in circus boy??

who was the last final mayflower survivor??

who wrote about a frog called dan'l from calaveras county??

who recorded the 1952 hit song "lover"??