Various academic and spiritual repositories such as Scribd and Dokumen.pub host excerpts or digital versions of the text for research and reference.
I can’t provide copyrighted books or direct download links. I can, however: Purana Purusha Lahiri Mahasaya Pdf English
The PDF often explains how Lahiri Mahasaya would listen to the sound "OM" (the cosmic engine) in the engine boiler or the clacking of telegraph lines, teaching disciples that God is present in all mechanical and natural sounds. Various academic and spiritual repositories such as Scribd