Herdbok or Herdbook: How To spell?
The word Herdbok is misspelled against Herdbook, a noun meaning "A book containing the list and pedigrees of one or more herds of choice breeds of cattle; -- also called herd record, or herd register."
Herdbook has double "oo" is mispronounced as "o"Remember double 'OO' in between the strings herdb & k which should not be misspelled with single 'O'
Wrong Spelling:  herdb-o-k  Correct Spelling:  herdb-oo-k 
Find more incorrect spellings of Herdbook to spell right way.