The National Academies Press [Электронный ресурс] / National Academy of Sciences. — Электрон. данные. — Washington: National Academy, 2003. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Internet Explorer 6.0. — <URL:http://www.nap.edu>.
| Period | Read | Copy | Open | Total | |
|---|---|---|---|---|---|
| Year 2012 | 0 | 0 | 0 | 4 | 4 |
| 2013 | 0 | 0 | 0 | 0 | 0 |
| Year 2014 | 0 | 0 | 0 | 3 | 3 |
| Year 2015 | 0 | 0 | 0 | 10 | 10 |
| Year 2016 | 0 | 0 | 0 | 4 | 4 |
| Year 2017 | 0 | 0 | 0 | 1 | 1 |
| Year 2018 | 0 | 0 | 0 | 2 | 2 |
| 2019 | 0 | 0 | 0 | 0 | 0 |
| 2020 | 0 | 0 | 0 | 0 | 0 |
| Year 2021 | 0 | 0 | 0 | 9 | 9 |
| Year 2022 | 0 | 0 | 0 | 8 | 8 |
| Year 2023 | 0 | 0 | 0 | 46 | 46 |
| Year 2024 | 0 | 0 | 0 | 55 | 55 |
| Year 2025 | 0 | 0 | 0 | 1 | 1 |
| Total | 0 | 0 | 0 | 143 | 143 |