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href="https://www.iucr.org/iucr/commissions/principles">principles</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/aperiodic-crystals">aperiodic crystals</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/biological-macromolecules">biological macromolecules</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/crystal-growth">crystal growth and characterization of materials</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/crystallographic-computing">crystallographic computing</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/nomenclature">crystallographic nomenclature</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/teaching">crystallographic teaching</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/art-and-cultural-heritage">crystallography in art and cultural heritage</a> </li> <li> <a href="https://www.iucr.org/iucr/commissions/crystallography-of-materials">crystallography of materials</a> </li> <li> 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xix</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xviii">1999 iucr xviii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xvii">1996 iucr xvii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xvi">1993 iucr xvi</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xv">1990 iucr xv</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xiv">1987 iucr xiv</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xiii">1984 iucr xiii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xii">1981 iucr xii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-xi">1978 iucr xi</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-x">1975 iucr x</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-ix">1972 iucr ix</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-viii">1969 iucr viii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-vii">1966 iucr vii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-vi">1963 iucr vi</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-v">1960 iucr v</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-iv">1957 iucr iv</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-iii">1954 iucr iii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-ii">1951 iucr ii</a> </li> <li> <a href="https://www.iucr.org/iucr/cong/iucr-i">1948 iucr i</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/sponsorship">support</a> <ul> <li> <a href="https://www.iucr.org/iucr/sponsorship/vp.html">visiting professorships</a> </li> <li> <a href="https://www.iucr.org/iucr/sponsorship/meetings.html">meetings</a> </li> <li> <a href="https://www.iucr.org/iucr/sponsorship/crystallography-in-africa">africa</a> </li> <li> <a href="https://www.iucr.org/iucr/sponsorship/iucr-outreach-fund">outreach and education</a> </li> </ul> </li> <li> <a class="drop" href="https://www.iucr.org/iucr/history">history</a> <ul> <li> <a href="https://www.iucr.org/iucr/history/aspects">aspects</a> </li> <li> <a href="https://www.iucr.org/iucr/history/early-history">early history</a> </li> <li> <a href="https://www.iucr.org/iucr/history/journals-history">journals history</a> </li> <li> <a href="https://www.iucr.org/iucr/history/extension">extension</a> </li> <li> <a href="https://www.iucr.org/iucr/history/previous">previous executive committees</a> </li> <li> <a href="https://www.iucr.org/iucr/history/photos">photos of crystallographers</a> </li> <li> <a href="https://www.iucr.org/iucr/history/xray-diffraction">50 years of x-ray diffraction</a> </li> </ul> </li> </ul> </li> <li><a class="drop" href="https://www.iucr.org/news">news</a> <ul> <li> <a class="drop" href="https://www.iucr.org/news/whats-new">what's new</a> <ul> <li> <a href="https://www.iucr.org/news/whats-new/whats-new-by-date">what's new by date</a> </li> <li> <a 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