Bengali literature is filled with great literary works such as Shramik Biggyan. Shramik Biggyan is a Bengali language Probondho genre book; that PDF copy is available here. The prominent Bengali language writer Panchanan Ghoshal wrote this book. The Public library initially published this Probondho book in 1969. If you are interested in reading this book, collect its PDF copy from the below link. The PDF copy is only 15 MB.