The first discovery in this order (52:182069) was made by William Tutte, using advanced rotor stator and network theory and published in 1950.
In 2014 Brian Trial found 4658 order 52 SPSSs using a new method to make SPSSs in higher orders.
In 2018-2020 Bernard Moss found 949 order 52 SPSSs using his transforms, many made by transforming Brian Trial's 2014 discoveries.
There are 5608 known SPSSs of Order 52. Files provided as;