There have been twelve accruals. The first accrual consists of: manuscripts and typescripts of some published works; literary correspondence; and typescripts and related correspondence pertaining to specific poetry. It is divided into two series: manuscripts and typescripts; and literary correspondence, which is divided into two subseries (correspondence relating to individual poetry books; and general literary correspondence). The second accrual consists correspondence and manuscripts arranged into three series: Harbinger Poetry, the Literary Review of Canada and Levenson's collected poems. The third accrual consists of four series: collected poems; manuscripts and typescripts; other literary activities; correspondence. The fourth accrual consists of four series: manuscripts, collected poems, sound recording, personal and literary correspondence. The fifth accrual consists of three series: writings, correspondence, and other work. The sixth accrual contains writing and correspondence. The seventh accrual consists of the collected poems for Levenson's thirteenth volume of poetry, as well as correspondence, recordings, and teaching material. The eighth accrual includes reviews, publications, and posters. The ninth accrual consists of the collected poems for Levenson's fourteenth volume of poetry, correspondence, and recordings. The tenth accrual consists of collected poems for Levenson’s fourteenth volume of poetry and correspondence. The eleventh accrual combines accessions 2020—015 and 2021-008. It consists of correspondence, poetry for Levenson’s fourteenth and fifteenth volumes; recordings and Dutch translation of Levenson’s book of poetry. The twelfth accrual is arranged into the following series: Writing; Literary activities; Society of Friends (Quakers); Teaching, Readings, Workshops and publications; Correspondence.