how to find the same sounds in an audio file

Hello there,
I have this problem. I have more files connected to one huge file… that huge file contain the same sounds in the audio track several times in a row.
I need to find and delete redundant repetitive sounds from this file to only one time.
Can it be done automatically or I need to search for it manually?
File has 1 1/2 hours
thank you
sorry my english is bad… foreign person

Spectrogram view helps (manually) identify sounds.