Opera Omnia

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PDF is OCRed Greek original of his Epistola ad virgines, sermo de virginitate, sive de ascesi (Περι παρθενιασ πρὸς τὴν παρθένον), from here; cols. 251-84 (DjVu pp. 127-143), probably among the shortest De virginitate treatises (~15 cols.). This seems to be one of the most-cited De virginitate treatises in Vizmanos's Las Virgenes Cristianas de la Iglesia Primitiva. {≠ (Ps.-?)Athanasius's much longer De virginitate.} Engl. translation, pp. 85-97 (PDF pp. 5-15) in:

• Teresa M. Shaw, “5. Pseudo-Athanasius: Discourse on Salvation to a Virgin,” in Religions of Late Antiquity in Practice , ed. Richard Valantasis (Princeton University Press, 2000), 82–99.§8 of this de virginitate says: "πάντα ἁγνὰ ὅσα ἄψυχα." ("Everything is pure as long as it is non-animal."), which seems a bit too Encratite to be genuinely St. Athanasius, though in context his rules for fasting are reasonable/orthodox; cf. my comments on von der Goltz's thesis.

from Fr. Unger's book on the single life:

From the early Alexandrian school we have no treatise on the subject, even though in the nearby deserts the hermitic life flourished. But Clement of Alexandria (d. before 215), though he extolled the conjugal state very highly, was aware of the more perfect state of virginity. Origen composed no special treatise on chastity or virginity, yet he wrote so well on the topic in many places of his works that if these were all gathered into one work, they would make one of the finest works in the literature on virginity. St. Athanasius (d. 373), who while in exile had been able to observe the heroic virtue of the monks in the desert, and subsequently composed The Life of St. Anthony , also wrote sometime between 350 and 360 [Vizmanos p. xix, DjVu p. 17 says: c. 353-373] a work On Virginity, which is a real treasury of counsels for virgin souls.

cf. Perrin, O.P.'s Virginity PDF p. 106

"What is the earliest manuscript of the Gloria in excelsis Deo (Greater Doxology) hymn?"

According to Adrian Fortescue's The Mass: A Study in the Roman Liturgy, "§6. Gloria in Excelsis", p. 238, the Gloria in excelsis

is found first [in Greek] in St. Athanasius' treatise: de Virginitate [sive de ascesi]1 as part of morning prayer (with Ps. lxii, and the Benedicite) and in the [Greek Old and New Testament manuscript, the] Codex alexandrinus (Vth cent.).2

1. C. 20 (P.G. xxviii, 275). The authenticity of this work, long disputed, now seems more generally admitted. See Eichhorn: Athanasii de vita ascetica testimonia (Halle, 1886) pp. 27 seq., and especially von der Goltz in Texte und Untersuchungen , N.S. xiv, 2 a.2. As an appendix to the psalms at the end.

cf. also "Psalter" and my answer to the question "How did the Catholic Church function logistically/liturgically prior to the invention of the printing press?"