In addition to the four surviving works briefly described above and such presumably lost works as the rGyal sras snang ba of rNgog's tradition, several other bstan rims are mentioned in bibliographical sources but are thought to be no longer extant. One such case is the bstan rim composed by Atiśa's translator Nag tsho lo tsā ba Tshul khrims rgyal ba (b. 1011), the so-called Nag tsho'i bstan rim. Though this work survived and was taught at least as late as the fourteenth century (it was studied for instance by mKhan chen bSod nams grags pa [1273-1345], according to Khetsun Sangpo, vol. 5: 459), its exact contents and structure are unknown. According to Thu'u bkwan (GSM: 112), these teachings were an independent line of lam rim instructions which, through the lineage coming down from Nag tsho's disciple Lag sor ba, resulted in the composition of other written manuals. A much earlier source, the Deb ther dmar po ("Red Annals") of Tshal pa Kun dga' rdo rje (composed 1346), states that Nag tsho's disciple Rong pa Phyag sor pa [sic] (fl. mid-eleventh century) stayed his whole life in meditative retreat, only coming out to mediate a violent dispute. At that time he was invited to 'U shang rdo, where he gave a religious discourse to some five hundred monks. Among those present, four assistant teachers each took notes of his sermons,[page 240] and from them, four bstan rim came into being, namely those by the so-called "Four sons of Rong-pa": (1) Zul bya 'Dul ba 'dzin pa, (2) Rog sTag can pa, (3) gTsang na Zhu ldan pa, and (4) rNam par ba. The last of the four founded the temples of rNam pa and Ram pa Lha lding, and served for seven years as monastic leader of gSang phu Ne'u thog. The tradition of these masters was the Rong pa'i bka' brgyud, and it became known also as the "Lower bKa' gdams" because Rong pa's temple of bCom chung ba was situated below Rwa sgreng (Tshal pa Kun dga' rdo rje, DM: 65-66).

Still another unavailable but perhaps similar treatise was the so-called Lam mchog of Gro ston bDud rtsi grags (fourth abbot of sNar thang, fl. early thirteenth century), which is listed by A khu chin Shes rab rgya mtsho (1803-1875) among the lam rim works proper (MHTL 11117). Also listed there is its commentary by mChims Nam mkha' grags (1210-1285, seventh abbot of sNar thang) that became known to the later tradition as "mChims Nam mkha' grags's bsTan rim" (MHTL 11118).7

I have not mentioned here such important introductory manuals of Mahāyāna practice as the sNang gsum manuals of the Sa skya pa Lam 'bras or the Kun bzang bla ma'i zhal lung for the rDzogs chen nying thig, because, though they too contain Tibetan expositions of Mahāyāna practice, they are primarily appendages to other teaching cycles—in these cases, systems of tantric instructions. Thus, although in content and even topical arrangement they are sometimes similar, such preparatory manuals (sngon 'gro'i 'khrid yig) should be distinguished, since a true lam rim or bstan rim sets out to teach the general Mahāyāna as a path in itself sufficient for reaching the highest goal of buddhahood. Against this view some might argue that lam rims—including Tsong kha pa's, Bo dong Paṇ chen's, and even Atiśa's Byang chub lam sgron itself—presuppose the supremacy of Tantra, and assume that the disciple will choose that path after training him- or herself in every stage of the general Mahāyāna. The lam rims typically do include at the end a brief introductory mention of Tantra. Still, there is sufficient reason to classify and treat the introductory manuals (sngon 'gro) to the tantric practices separately from the lam rim and bstan rim types, just as one should also keep separate such general Mahāyāna teachings as the briefer "mind-training" (blo sbyong) instructions and their commentatorial literature (see Sweet, in this volume), though topically they sometimes cover almost the same ground as the lam rims and bstan rims.[page 241]