The revealed teachings of the Sku-gsum Dgoṅs-'dus Gro-'dul Pad-rgyal Gliṅ-pa / 4 - 'Gro-'dul-pad-rgyal-gliṅ pa, Sku-gsum Dgoṅs-'dus (The revealed teachings of the Sku-gsum Dgoṅs-'dus Gro-'dul Pad-rgyal Gliṅ-pa, 1987)