The Denver Broncos have not had any receiving touchdowns all-time.

who+is+the+author+nfl+all+time+leading+rec+record+holder+for+ touchdowns+from+port+returns+and+kick-off+returns
Interpreted as:
Who+is+the+author+NFL+all+time+leading+rec+record+holder+for+ receiving touchdowns+from+port+returns+and+kick-off+returns?

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