Вейцман, Р.Я. Коммерческие вычисления: Рекомендовано в качестве руководства для промышленных школ / Р.Я. Вейцман. — 8-е изд., испр. и доп. — М.: ВЦСПО, 1925. — 216 с. — Из коллекции Н.Р.Вейцмана. — Свободный доступ из сети Интернет (чтение). — <URL:http://elib.fa.ru/oldbook/Vejtsman3.pdf>.
| Period | Read | Copy | Open | Total | |||
|---|---|---|---|---|---|---|---|
| Year 2021 | Quarter 3 | September | 19 | 0 | 0 | 0 | 19 |
| Quarter 4 | October | 11 | 0 | 0 | 0 | 11 | |
| November | 14 | 0 | 0 | 0 | 14 | ||
| December | 12 | 0 | 0 | 0 | 12 | ||
| Year 2022 | Quarter 1 | January | 9 | 0 | 0 | 0 | 9 |
| February | 6 | 0 | 0 | 0 | 6 | ||
| March | 9 | 0 | 0 | 0 | 9 | ||
| Quarter 2 | April | 8 | 0 | 0 | 0 | 8 | |
| May | 10 | 0 | 0 | 0 | 10 | ||
| June | 12 | 0 | 0 | 0 | 12 | ||
| Quarter 3 | July | 7 | 0 | 0 | 0 | 7 | |
| August | 6 | 0 | 0 | 0 | 6 | ||
| September | 7 | 0 | 0 | 0 | 7 | ||
| Quarter 4 | October | 10 | 0 | 0 | 0 | 10 | |
| November | 12 | 0 | 0 | 0 | 12 | ||
| December | 12 | 0 | 0 | 0 | 12 | ||
| Year 2023 | Quarter 1 | January | 11 | 0 | 0 | 0 | 11 |
| February | 10 | 0 | 0 | 0 | 10 | ||
| March | 8 | 0 | 0 | 0 | 8 | ||
| Quarter 2 | April | 6 | 0 | 0 | 0 | 6 | |
| May | 9 | 0 | 0 | 0 | 9 | ||
| June | 6 | 0 | 0 | 0 | 6 | ||
| Quarter 3 | July | 3 | 0 | 0 | 0 | 3 | |
| August | 2 | 0 | 0 | 0 | 2 | ||
| September | 12 | 0 | 0 | 0 | 12 | ||
| Quarter 4 | October | 14 | 0 | 0 | 0 | 14 | |
| November | 2 | 0 | 0 | 0 | 2 | ||
| December | 2 | 0 | 0 | 0 | 2 | ||
| Year 2024 | Quarter 1 | January | 6 | 0 | 0 | 0 | 6 |
| February | 8 | 0 | 0 | 0 | 8 | ||
| March | 9 | 0 | 0 | 0 | 9 | ||
| Quarter 2 | April | 10 | 0 | 0 | 0 | 10 | |
| May | 25 | 0 | 0 | 0 | 25 | ||
| June | 24 | 0 | 0 | 0 | 24 | ||
| Quarter 3 | July | 8 | 0 | 0 | 0 | 8 | |
| August | 9 | 0 | 0 | 0 | 9 | ||
| September | 11 | 0 | 0 | 0 | 11 | ||
| Quarter 4 | October | 8 | 0 | 0 | 0 | 8 | |
| November | 13 | 0 | 0 | 0 | 13 | ||
| December | 12 | 0 | 0 | 0 | 12 | ||
| Year 2025 | Quarter 1 | January | 20 | 0 | 0 | 0 | 20 |
| February | 6 | 0 | 0 | 0 | 6 | ||
| March | 20 | 0 | 0 | 0 | 20 | ||
| Quarter 2 | April | 18 | 0 | 0 | 0 | 18 | |
| May | 14 | 0 | 0 | 0 | 14 | ||
| June | 11 | 0 | 0 | 0 | 11 | ||
| Quarter 3 | July | 15 | 0 | 0 | 0 | 15 | |
| August | 17 | 0 | 0 | 0 | 17 | ||
| September | 18 | 0 | 0 | 0 | 18 | ||
| Quarter 4 | October | 26 | 0 | 0 | 0 | 26 | |
| November | 27 | 0 | 0 | 0 | 27 | ||
| December | 17 | 0 | 0 | 0 | 17 | ||
| Year 2026 | Quarter 1 | January | 16 | 0 | 0 | 0 | 16 |
| February | 21 | 0 | 0 | 0 | 21 | ||
| March | 8 | 0 | 0 | 0 | 8 | ||
| Total | 646 | 0 | 0 | 0 | 646 | ||