Shipments to the United States
Due to changes in U.S. customs regulations, all shipments to the United States are now subject to customs clearance.
This means that the recipient will be required to pay customs duties, as well as any applicable taxes and fees upon import.
Please also note that delivery may be delayed while the shipment is being processed by U.S. customs.
![Cover for M. Sachs · Quantum Mechanics from General Relativity: an Approximation for a Theory of Inertia - Fundamental Theories of Physics (Paperback Book) [Softcover Reprint of the Original 1st Ed. 1986 edition] (2011)](https://imusic.b-cdn.net/images/item/original/731/9789401085731.jpg?m-sachs-2011-quantum-mechanics-from-general-relativity-an-approximation-for-a-theory-of-inertia-fundamental-theories-of-physics-paperback-book&class=scaled&v=1608771061)
![Cover for M. Sachs · General Relativity and Matter: a Spinor Field Theory from Fermis to Light-years - Fundamental Theories of Physics (Paperback Book) [1st Ed. Softcover of Orig. Ed. 1982 edition] (2010)](https://imusic.b-cdn.net/images/item/original/708/9789048183708.jpg?m-sachs-2010-general-relativity-and-matter-a-spinor-field-theory-from-fermis-to-light-years-fundamental-theories-of-physics-paperback-book&class=scaled&v=1579431317)
![Cover for M. Sachs · Quantum Mechanics from General Relativity: An Approximation for a Theory of Inertia - Fundamental Theories of Physics (Hardcover Book) [1986 edition] (1986)](https://imusic.b-cdn.net/images/item/original/478/9789027722478.jpg?m-sachs-1986-quantum-mechanics-from-general-relativity-an-approximation-for-a-theory-of-inertia-fundamental-theories-of-physics-hardcover-book&class=scaled&v=1613569807)
![Cover for M. Sachs · General Relativity and Matter: A Spinor Field Theory from Fermis to Light-Years - Fundamental Theories of Physics (Hardcover Book) [1982 edition] (1982)](https://imusic.b-cdn.net/images/item/original/810/9789027713810.jpg?m-sachs-1982-general-relativity-and-matter-a-spinor-field-theory-from-fermis-to-light-years-fundamental-theories-of-physics-hardcover-book&class=scaled&v=1579431320)