Combining mp3 audio files into chapters on an audio book -- 2

I have 57 8 minute mp3 files that I need to combine into 19 chapters from an audio book so I can listen to each chapter multiple times. I can provide you with the names of the chapters, but cannot tell you exactly where they are in the audio file. I have attacched 3 audio files for an example of what they sould like. I have no idea of how much time it will take.