Comparative Investigation on Drying Efficiency of the Solar Dryer Using Black Limestone as the Absorber Plate Against the Stainless Steel Absorber Plate for Drying Copra. Journal of Pharmaceutical Negative Results [Internet]. 2022 Sep. 27 [cited 2026 Jun. 3];:685-91. Available from: https://www.pnrjournal.com/index.php/home/article/view/961