How do you write singular form of los libros in spanish form

Is my queen, my bestfriens, my everything, my world try one of them ok

1. chiriquí a province that shares an indigenous culture with colombia. 2. san blas the largest population of indigenous people in panama. 3. bocas del toro in this province, the women make brightly-colored, embroidered blouses. 4. panama province home to three different groups of indigenous people in panama. 5. darien has less of an indigenous population than most other provinces in panama.